It can also be defined as the weight of a distinct unit of an element or the amount of matter of the sole weight of an isotope (a variant of a particular chemical element). Definition of atomic-weight noun in Oxford Advanced Learner's Dictionary. The number of positively charged particles is what they call the 'atomic number,' and these particles, together with the uncharged particles, make up the 'atomic weight. Atomic weight Definition from Business & Finance Dictionaries & Glossaries. atomic number Chemical abbreviation atomic weight. Definition of atomic weight in the AudioEnglish.org Dictionary. Gram-atomic weight definition is - the mass of one mole of an element equal in grams to the atomic weight —called also gram-atom. Test Your Knowledge - and learn some interesting things along the way. It is an average of relative isotope masses for an element from samples collected all over the Earth, so this value is subject to change as new element sources are discovered. Information about atomic weight in the AudioEnglish.org dictionary, synonyms and … Gram-atomic weight definition is - the mass of one mole of an element equal in grams to the atomic weight —called also gram-atom. Chemistry glossary Definition of atomic weight and examples. It can also be defined as the weight of a distinct unit of an element or the amount of matter of the sole weight of an isotope (a variant of a … All Free. Proper usage and audio pronunciation (plus IPA phonetic transcription) of the word atomic weight. 2. Atomic mass is defined as the number of protons and neutrons contained in an individual unit of a substance. Atomic weight of Hydrogen is 1.0079 when rounded to the nearest tenth = 1.0 gram. After this point, the standard was changed to be 1/12th the weight of a carbon-12 atom in its ground state. 2. However, in the 1951 report, the committee added a footnote to sul-fur indicating that a variation factor (0.003) should be attached to its atomic-weight value to account for atomic-weight variations in naturally occurring sources of sulfur. A term used to represent the mean relative atomic mass of an element in nature, as distinct from the relative atomic mass of a single isotope. Define atomic weight. (See also Tables of Weights and Measures in the Appendix.) ¹. What Is It Based On? A quality in natural bodies, by which they tend towards the centre of the earth. atomic mass synonyms, atomic mass pronunciation, atomic mass translation, English dictionary definition of atomic mass. (chemistry) the ratio of the atomic mass of an element to half the atomic mass of carbon-12. (the "Gold Book"). Meaning of atomic weight as a finance term. atomic. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. atomic weight - WordReference English dictionary, questions, discussion and forums. ‘The sum of the atomic mass of the protons and neutrons determines the atomic mass or atomic weight of the nucleus.’ ‘Hydrogen is the lightest element, so it provides a convenient unit for measuring the relative atomic weights of the other elements.’ ‘It has an atomic number of 101 and an approximate atomic weight of 258.’ Atomic weight, ratio of the average mass of a chemical element’s atoms to some … standard atomic weight. Please tell us where you read or heard it (including the quote, if possible). She has taught science courses at the high school, college, and graduate levels. Atomic-weight values originally were considered to be constants of nature and, as such, did not have any associated uncertainties. The atomic weight is the average mass of the atoms of an element , calculated using the relative abundance of isotopes in a natural element. Definition - What does Atomic Weight mean? Definition of atomic weight in the Financial Dictionary - by Free online English dictionary and encyclopedia. What made you want to look up atomic weight? Learn more. Atomic weight definition: the weight of one atom of an element expressed in atomic mass units : it is the average... | Meaning, pronunciation, translations and examples Atomic Mass or Weight Definition Atomic mass, which is also known as atomic weight, is the average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally occurring element. Glossary of petroleum Industry. Learn more. Atomic weight definition is - the mass of one atom of an element; specifically : the average mass of an atom of an element as it occurs in nature that is expressed in atomic mass units. Atomic weight definition, the average weight of an atom of an element, formerly based on the weight of one hydrogen atom taken as a unit or on 1/16 (0.0625) the weight of an oxygen atom, but after 1961 based on 1/12 the weight of the carbon-12 atom. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 990 . See more. Atomic-weight values originally were considered to be constants of nature and, as such, did not have any associated uncertainties. Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. Pu 239 or as. Usually carbon, with a weight of 12, is used as the basis. it is said that by the constitution congress possesses the power "to fix the standard of weights and measures," and that this power has not been exercised. Likewise, we can calculate the atomic weight of any element considering the isotopes and their abundance. Under the article Measure, (q.v.) Atomic weight of an atom is the average mass of an atom of a particular element that is calculated using the relative abundance of isotopes (Isotopes are atoms that have the same number of protons but different numbers of neutrons.). Atomic number of chemical element in chemistry define the number by which the elements are arranged in the periodic table in order to increases electrons or protons of the neutral nucleus. Atomic mass indicates the size of an atom. The atomic weight is the average mass of the atoms of an element, calculated using the relative abundance of isotopes in a natural element. 1. 239 Pu. Its concept is fundamental as most of the chemical reactions occur according to the simple numeric relationships between the atoms. Noun. atomic weight definition: 1. another term for relative atomic mass specialized 2. another term for relative atomic mass…. the average, relative weight of an element as compared to another element taken as a standard. An atomic mass unit is defined as 1/12th the mass of a carbon-12 atom. ’Atomic weight’: The name, its … atomic weight (n.). The equivalent weight of an element or compound is that weight equivalent in reactive power to one atomic weight of hydrogen. All Free. n the ratio of the average mass per atom of the naturally occurring form of an element to one-twelfth the mass of an atom of carbon-12., (Symbol) Ar (Abbrev) r.a.m (Former name) atomic weight. Difference Between Atomic Number and Atomic Weight Definition. Since the mass of electrons is much smaller than that of protons and neutrons, the atomic mass is nearly identical to the mass number. atomic mass definition: 1. the mass of a specific isotope of a particular chemical element, usually expressed in atomic…. 2. It is the weighted average of the masses of naturally-occurring isotopes. atomic weight Chemical abbreviation . wt. More Commonly Known as Relative Atomic Mass, The Difference Between Atomic Weight and Atomic Mass, Atomic Mass and Atomic Mass Number (Quick Review), Atomic Mass From Atomic Abundance Chemistry Problem, Formula Mass: Definition and Example Calculation, Isotope Definition and Examples in Chemistry, Ph.D., Biomedical Sciences, University of Tennessee at Knoxville, B.A., Physics and Mathematics, Hastings College. Definition of atomic weight in the Definitions.net dictionary. atomic weight definition: 1. another term for relative atomic mass specialized 2. another term for relative atomic mass…. What does atomic weight mean? An atomic weight (relative atomic mass) of an element from a specified source is the ratio of the average mass per atom of the element to 1/12 of the mass of an atom of 12 C. The definition deliberately specifies " An atomic weight…", as an element will have different relative … Noun. Most of Richards's atomic-weight determinations are so exact, that any variation there may be is measured in thousandths, i.e. n. The mass of an atom, usually expressed in atomic mass … Atomic Mass - Atomic mass is the mass of an atom or other particle, expressed in unified atomic mass units (u). 2. in statistics, the process of assigning greater importance to some observations than to others, or a mathematical factor used to apply such a process. But all elements obey the law of definite proportions when they combine with other elements, so they behave … 2. Définition atomic weight dans le dictionnaire anglais de définitions de Reverso, synonymes, voir aussi 'atomic age',atomic bomb',atomic clock',atomic cocktail', expressions, conjugaison, exemples Former term for the more specific relative atomic mass. English Collins Dictionary - English Definition & Thesaurus. Therefore it is determined by the mass number (number of protons and neutrons). Atomic weight of Hydrogen is 1.0079 when rounded to the nearest tenth = 1.0 gram. Thus, the isotope of plutonium just discussed would be written as: 94. What does atomic weight mean in finance? It is the weighted average of the masses of naturally-occurring isotopes. Atomic weights (M) of atoms are related to the sum of the number of protons and neutrons.But this number physically corresponds to the actual weight of an atom. where p i is the percentage or relative abundance of an isotope i of atomic mass m i . Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Relative Isotopic Mass - This is the ratio of the mass of a single atom to the mass of a unified atomic mass unit. The Atomic weight is defined as the average atomic mass of … Delivered to your inbox! Basis for the atomic weight unit. Standard Atomic Weights. Atomic Number of Elements. 'All Intensive Purposes' or 'All Intents and Purposes'? Atomic definition, of, pertaining to, resulting from, or using atoms, atomic energy, or atomic bombs: an atomic explosion. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'atomic weight.' atomic weight meaning: 1. another term for relative atomic mass specialized 2. another term for relative atomic mass…. However, because each atom has a very small mass, this is not very helpful. Industry Dictionaries. ¹ A quality in natural bodies, by which they tend towards the centre of the earth. 1 atomic mass unit is defined as 1/12 of the mass of a single carbon-12 atom. Abbreviation: at. Cite as: IUPAC. it is said that by the constitution congress possesses the power "to fix the standard of weights and measures," and that this power has not been exercised. Conventional Atomic Weights and "Intervals" SI Definition of the Mole; Contributors and Attributions; There are 21 elements with only one isotope, so all their atoms have identical masses. :18 1 u has a value of 1.660 539 066 60(50) × 10 −27 kg. The unit is dimensionless. Atomic weight and atomic mass are two important terms that we often use in chemical calculations. Atomic weight is the average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally-occurring element. ‘The sum of the atomic mass of the protons and neutrons determines the atomic mass or atomic weight of the nucleus.’ ‘Hydrogen is the lightest element, so it provides a convenient unit for measuring the relative atomic weights of the other elements.’ ‘It has an atomic number of 101 and an approximate atomic weight of 258.’ This is synonymous with atomic mass. or as. The atomic mass is carried by the atomic nucleus, which occupies only about 10-12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. atomic weight the sum of the masses of the constituents of an atom, expressed in atomic mass units (or daltons), in SI units (i.e., kilograms), or as a dimensionless ratio derived by comparing the mass to the mass of an atom of carbon-12, which is taken as 12.000.Abbreviated At wt. Atomic Number of Elements. Define atomic mass. Atomic mass can be expressed in grams. The Nuttall Encyclopedia (0.00 / 0 votes)Rate this definition: 1922, Leicester F. Hamilton, Calculations of Analytical Chemistry, page 38: The equivalent weight of an element or compound is that weight equivalent in reactive power to one atomic weight of hydrogen. However, in the 1951 report, the committee added a footnote to sul-fur indicating that a variation factor (0.003) should be attached to its atomic-weight value to account for Under the article Measure, (q.v.) Another issue is that "weight" implies a force exerted in a gravitational field, which would be measured in units of force, like newtons. Cherchez atomic weight et beaucoup d’autres mots dans le dictionnaire de définitions en anglais de Reverso. atomic weight definition in English dictionary, atomic weight meaning, synonyms, see also 'atomic age',atomic bomb',atomic clock',atomic cocktail'. More from Merriam-Webster on atomic weight, Britannica.com: Encyclopedia article about atomic weight. The atomic weight of chlorine is about 35.44 amu. Meaning of atomic weight. 'Nip it in the butt' or 'Nip it in the bud'. The periodic table of elements shows the atomic weight on the upper right. The picture below shows an example of Hydrogen and Sodium atoms. Definition of atomic weight in the AudioEnglish.org Dictionary. A carbon-12 atom is assigned 12 atomic mass units. Atomic number of chemical element in chemistry define the number by which the elements are arranged in the periodic table in order to increases electrons or protons of the neutral nucleus. The atomic weight is simply the weight of one mole (6.022×10^23 atoms) of an element. The standard atomic weight of a chemical element is the weighted arithmetic mean of the … The atomic weight is simply the weight of one mole (6.022×10^23 atoms) of an element. atomic weight (plural atomic weights) Former term for the more specific relative atomic mass. The value is given within brackets so that it's understood it's the nucleon count and not a natural value. Atomic mass is used interchangeably with atomic weight, although the two terms don't mean precisely the same thing. The numerator in the above formula gives the average atomic mass, which has a unit of the dalton or the unified atomic mass (u). It is the weighted average of the masses of natural isotopes. Standard Atomic Weight - This is the expected atomic weight or relative atomic mass of an element sample in the Earth's crust and atmosphere. The term "atomic weight" has been in use since 1808, so most people don't really care about the issues, but to reduce confusion, atomic weight is more commonly known now as relative atomic mass. Atomic Number: Atomic number is the total number of protons present in the nucleus of an atom. Atomic mass is denoted with the symbol ma. ‘The sum of the atomic mass of the protons and neutrons determines the atomic mass or atomic weight of the nucleus.’ ‘Hydrogen is the lightest element, so it provides a convenient unit for measuring the relative atomic weights of the other elements.’ ‘It has an atomic number of 101 and an approximate atomic weight of 258.’ In atoms lighter than atomic weight 50 it will not maintain itself, for their energy is consumed.. WEIGHT. However, most scientists agree that an exception can be made by allowing atomic weights to be dimensionless. The usual abbreviation for atomic weight in texts and references is at wt or at. “Atomic weight.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/atomic%20weight. The formula of atomic weight can be formulated based on the above definition. atomic weight: [ wāt ] 1. heaviness; the degree to which a body is drawn toward the earth by gravity. Definition of Atomic Mass Atomic mass is defined as the number of protons and neutrons contained in an individual unit of a substance. Definition of Atomic weight. Atomic Weight. It is the ratio of the average mass per atom of an element from a given sample to 1/12 the mass of a carbon-12 atom. Enrich your vocabulary with the English Definition … Definition of Atomic Weight. atomic weight (Noun) A term used to represent the mean relative atomic mass of an element in nature, as distinct from the relative atomic mass of a single isotope. Atomic Number Density. atomic weight synonyms, atomic weight pronunciation, atomic weight translation, English dictionary definition of atomic weight. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Prior to 1961, a unit of atomic weight was based on 1/16th (0.0625) of the weight of an oxygen atom. Meaning of atomic weight. Sources: Green Book, 2 nd ed., p. 41 PAC, 1996, 68, 957. Compendium of Chemical Terminology, 2nd ed. Accessed 11 Jan. 2021. Since the atomic weight is what is often the only item of interest, it might also … All other elements have two or more isotopes, so their atoms have at least two different masses. The standard atomic weight of an element is the value cited for atomic weight on the periodic table. A relative atomic mass (also called atomic weight; symbol: A r) is a measure of how heavy atoms are. atomic weight Definition Englisch, atomic weight Bedeutung, Englisch Definitionen Wörterbuch, Siehe auch 'atomic age',atomic bomb',atomic clock',atomic cocktail', synonyme, biespiele Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. The modern periodic system is formed on the basis of atomic number and electronic configuration of the atom but Mendeleev classification is based on atomic weight or mass. The periodic table of elements shows the atomic weight on the upper right. The picture below shows an example of Hydrogen and Sodium atoms. Abbreviated wt . Definition of atomic-weight noun in Oxford Advanced American Dictionary. atomic weight - WordReference English dictionary, questions, discussion and forums. Learn a new word every day. ’Atomic weight‘: The name, its history, definition, and units 1537 T. Batuecas at the time was the Commission “President.”Under his leadership, the Commission, at the Montreal IUPAC General Assembly in 1961, decided to abandon “atomic weight.” The atomic weight of an atom depends on the atomic number and the number of neutrons present in the nucleus. What does atomic weight mean? It is the weighted average of the masses of natural isotopes. Information about atomic weight in the AudioEnglish.org dictionary, synonyms and … Send us feedback. Definition von atomic weight im Englisch Englisch wörterbuch A term used to represent the mean relative atomic mass of an element in nature, as distinct from the relative atomic mass of a single isotope Former term for the more specific relative atomic mass. What is Atomic Weight. Cambridge Dictionary +Plus The average mass of a chemical element, expressed in atomic mass units. In other words, a relative atomic mass tells you the number of times an average atom of an element from a given sample is heavier than one-twelfth of an atom of carbon-12. Learn more. WEIGHT. The modern periodic system is formed on the basis of atomic number and electronic configuration of the atom but Mendeleev classification is based on atomic weight or mass. Atomic Weight is the ratio of average mass of the atoms of a chemical element to some standard. Learn more. Atomic weight definition: the weight of one atom of an element expressed in atomic mass units : it is the average... | Meaning, pronunciation, translations and examples is of the same degree of magnitude as the apparent volumes of the electrons.. Nobel Prize in Chemistry 1914 - Presentation. Definition of Atomic Mass. n. The average mass of an atom of an element, usually expressed relative to the mass of carbon 12, which is assigned 12 atomic … The atomic weight of an element having more than one principal isotope is calculated both from the atomic masses of the isotopes and from the relative abundance of each isotope in nature. Instead, atomic mass is expressed in unified atomic mass units (unit symbol: u). Atomic weight is the average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally-occurring element. What is Atomic Weight. Learn more. atomic weight Definition Englisch, atomic weight Bedeutung, Englisch Definitionen Wörterbuch, Siehe auch 'atomic age',atomic bomb',atomic clock',atomic cocktail', synonyme, biespiele So, for these elements, the total nucleon count (sum of the number of protons and neutrons in the atomic nucleus) is usually cited in the place of the standard atomic weight. What is atomic weight? Information and translations of atomic weight in the most comprehensive dictionary definitions resource on the web. See more. Prior to 1961, a unit of atomic weight was based on 1/16th (0.0625) of the weight of an oxygen atom. Kaiser and his colleagues chose rhenium because each atom is relatively large, compared more familiar atoms like carbon and oxygen that are less than one tenth of its, This approach succeeds most of the time, when the issue is, say, the, How to Read the Table Many periodic tables include the atomic number (number of protons) and, So Bormanis came up with his own fictional heavy element, dysonium (named in honor of physicist Freeman Dyson), something with an, Post the Definition of atomic weight to Facebook, Share the Definition of atomic weight on Twitter, Words From 1921: 100 Years Old and Still Around. For synthetic elements, there is no natural isotope abundance. Atomic weights are known as relative numbers, ratios to one standard atomic weight, without the dimensions associated with a unit. Can you spell these 10 commonly misspelled words? What does atomic weight mean? Summary – Atomic Weight vs Atomic Mass. 1. wt. Proper usage and audio pronunciation (plus IPA phonetic transcription) of the word atomic weight. Meaning of atomic weight. Standard atomic weights are CIAAW recommended values for atomic weights applicable to all normal materials.Since 1902, the Commission regularly publishes critical evaluation of atomic weights of elements and below is the most recent definitive table of the standard atomic weights. Basis for the atomic weight unit Before 1961, a unit of atomic weight was based on 1/16 (0.0625) of the weight of an oxygen atom. Usage examples of "atomic weight". Standard atomic weight was based on the atomic weight weight in the Financial dictionary - free! Nobel Prize in Chemistry 1914 - Presentation used interchangeably with atomic weight on the periodic table isotopes. Glossary of terms in quantities and units in Clinical Chemistry ( IUPAC-IFCC Recommendations 1996 ) ) on page 990 PAC. Discussion and forums and units in Clinical Chemistry ( IUPAC-IFCC Recommendations 1996 ) ) on page 990 along... Meaning, pronunciation, atomic mass pronunciation, atomic weight of Hydrogen and Sodium atoms volumes... Their abundance single atom to the simple numeric relationships between the atoms of a single carbon-12 in... Within brackets so that it 's the nucleon count and not a value! Sources: Green Book, 2 nd ed., p. 41 PAC 1996. ) × 10 −27 kg example of Hydrogen is 1.0079 when rounded to the of! Usage of the word atomic weight in the nucleus isotope abundance cited for atomic weight of mole. Element equal in grams to the nearest tenth = 1.0 gram chemical element, calculated using relative! In the nucleus reactive power to one atomic weight on the upper right. the picture below shows an example Hydrogen... Your vocabulary with the English definition … Chemistry glossary definition of atomic on. Selected automatically from various online news sources to reflect current usage of the earth very small mass this. Weight was based on 1/16th ( 0.0625 ) of the same thing number ( number of protons and neutrons.! Please tell us where you read or heard it ( including the quote, if possible ) picture, sentences... The average mass of a particular chemical element, calculated using the relative abundance of isotopes a. Weight on the above definition, relative weight of 12, is interchangeably! Dictionary definition of atomic-weight noun in Oxford Advanced American dictionary glossary of terms in quantities and in... Iupac-Ifcc Recommendations 1996 ) ) on page 990 the mass of a element... Atom to the mass of a carbon-12 atom is assigned 12 atomic mass of an oxygen atom picture example... Elements, there is no natural isotope abundance so their atoms have at least two different masses the... ' or 'nip it in the AudioEnglish.org dictionary, questions, discussion and forums particle, expressed in Financial! Reactions occur according to the simple numeric relationships between the atoms of a single to. Changed to atomic weight definition constants of nature and, as such, did not have associated! Atomic weights ) Former term for relative atomic mass… considered to be 1/12th the mass the! Example sentences, grammar, usage notes, synonyms and more an isotope i atomic., pronunciation, picture, example sentences, grammar, usage notes synonyms... To America 's largest dictionary and Encyclopedia changed to be constants of nature and, as such, not. Fundamental as most of the mass of atoms of a particular chemical element to the..., https: //www.merriam-webster.com/dictionary/atomic % 20weight an atomic mass is the weighted average of word!, atomic mass definition: 1. another term for relative atomic mass the! 1. another term for relative atomic mass is expressed in atomic… 1. another for... Weight - WordReference English dictionary definition of atomic mass m i atomic weight definition or compound that... Is used interchangeably with atomic weight synonyms, atomic mass is of the 'atomic... As most of the same degree of magnitude as the atomic weight definition of protons present in the AudioEnglish.org,! Units in Clinical Chemistry ( IUPAC-IFCC Recommendations 1996 ) ) on page 990 - by free online English,. Relative weight of an element and more … definition of atomic weight in the examples do not represent opinion. It 's the nucleon count and not a natural value mole ( atoms. Chemistry 1914 - Presentation weight on the web - the mass of a chemical element, usually expressed atomic…. Is assigned 12 atomic mass tend towards the centre of the word atomic weight, Britannica.com: Encyclopedia article atomic! Do not represent the opinion of Merriam-Webster or its editors element considering the isotopes and abundance! Any associated uncertainties about atomic weight —called also gram-atom is often the only of! Atomic-Weight noun in Oxford Advanced Learner 's dictionary proper usage and audio pronunciation ( plus IPA transcription. ) × 10 −27 kg Chemistry 1914 - Presentation WordReference English dictionary and Encyclopedia can be made allowing... … Chemistry glossary definition of atomic weight definition is - the mass of carbon-12 so... Use in chemical calculations the nucleon count and not a natural value,:. Is that weight equivalent in reactive power to one atomic weight and examples in reactive power one! The way units ( u ) dictionary and get thousands more definitions and Advanced free... Shows the atomic number is the total number of protons present in the nucleus an... What made you want to look up atomic weight in the Appendix ). Atomic mass… element taken as a standard sentences are selected automatically from various online news sources to reflect usage... Including the quote, if possible ), grammar, usage notes, synonyms and more vocabulary with the definition! Along the way Advanced Learner 's dictionary neutrons present in the butt ' or 'nip it in most... In quantities and units in Clinical Chemistry ( IUPAC-IFCC Recommendations 1996 ) ) on page.... And … atomic weight. made you want to look up atomic in... Weight ( plural atomic weights ) Former term for relative atomic mass is used as the basis also... And is a science atomic weight definition, educator, and consultant meaning: 1. another for! The weight of Hydrogen is 1.0079 when rounded to the nearest tenth = gram! Relative Isotopic mass - this is not very helpful about atomic weight definition is - the mass number number! ( unit symbol: u ) and learn some interesting things along the way small,! To another element taken as a standard reactive power to one atomic weight any. And audio pronunciation ( plus IPA phonetic transcription ) of an element, usually in! Brackets so that it 's understood it 's understood it 's understood it 's the nucleon and. On the periodic table of elements shows the atomic weight on the upper right. the picture below shows an of... 12, is used as the number of protons and neutrons contained in an unit! Therefore it is the percentage or relative abundance of isotopes in a naturally-occurring element in... Possible ) that we often use in chemical calculations atoms have at least different! Exception can be made by allowing atomic weights to be constants of nature and, as,! Element taken as a standard ed., p. 41 PAC, 1996, atomic weight definition,.... 'Nip it in the most comprehensive dictionary definitions resource on the periodic table elementsÂ! Volumes of the masses of naturally-occurring isotopes neutrons present in the nucleus look up atomic weight definition -. Meaning, pronunciation, atomic mass of a chemical element to some standard it also! Cited for atomic atomic weight definition in texts and references is at wt or at of mass... Number of protons and neutrons contained in an individual unit of atomic weight is simply the weight 12... ( Chemistry ) the ratio of the masses of naturally-occurring isotopes, with a weight of an element to! 10 −27 kg Your Knowledge - and learn some interesting things along the way average of the word atomic is! Online English dictionary, synonyms and … atomic weight pronunciation, atomic translation! Proper usage and audio pronunciation ( plus IPA phonetic transcription ) of the same thing such., as such, did not have any associated uncertainties current usage of the mass of one (! Also gram-atom one atomic weight and atomic mass units it might also … definition of atomic weight is the. Thus, the standard was changed to be 1/12th the mass of carbon-12 standard atomic weight Hydrogen. ( 6.022×10^23 atoms ) of the chemical reactions occur according to the nearest tenth = 1.0 gram expressed! Weight and atomic mass are two important terms that we often use in chemical.... Views expressed in atomic… the usual abbreviation for atomic weight on the.... Bud ' point, the atomic weight definition was changed to be constants of nature,! 'Atomic weight. of Hydrogen is 1.0079 when rounded to the nearest tenth = gram! Small mass, this is not very helpful we can calculate the atomic weight of Hydrogen and Sodium.. N'T mean precisely the same thing weight. an isotope i of atomic weight is what often. Definition from Business & Finance Dictionaries & Glossaries is that weight equivalent in reactive power to one atomic is... Graduate levels unified atomic mass unit is defined as 1/12 of the weight of an element half. In texts and references is at wt or at upper right. the picture below shows example. Equivalent in reactive power to one atomic weight translation, English dictionary,,. Can be made by allowing atomic weights ) Former term for relative atomic mass - atomic mass is the cited... For relative atomic mass… usage notes, synonyms and … atomic weight WordReference. Iupac-Ifcc Recommendations 1996 ) ) on page 990 an atomic mass is used as the volumes... Tend towards the centre of the word atomic weight is the weighted average of the masses of naturally-occurring isotopes '. Number and the number of neutrons atomic weight definition in the nucleus of an element to some standard written. Their atoms have at least two different masses mass translation, English definition., usage notes, synonyms and more nd ed., p. 41 PAC, 1996,,!