atomic weight definition

Atomic weight of Hydrogen is 1.0079 when rounded to the nearest tenth = 1.0 gram. Industry Dictionaries. The unit is dimensionless. What does atomic weight mean? 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. Compendium of Chemical Terminology, 2nd ed. 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. A carbon-12 atom is assigned 12 atomic mass units. 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). Since the atomic weight is what is often the only item of interest, it might also … atomic weight (n.). 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. Information about atomic weight in the AudioEnglish.org dictionary, synonyms and … 'Nip it in the butt' or 'Nip it in the bud'. ’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.” Sources: Green Book, 2 nd ed., p. 41 PAC, 1996, 68, 957. 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 n. The average mass of an atom of an element, usually expressed relative to the mass of carbon 12, which is assigned 12 atomic … Atomic weights are known as relative numbers, ratios to one standard atomic weight, without the dimensions associated with a unit. 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. wt. A quality in natural bodies, by which they tend towards the centre of the earth. 'All Intensive Purposes' or 'All Intents and Purposes'? 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. All Free. Atomic weight is the average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally-occurring element. Gram-atomic weight definition is - the mass of one mole of an element equal in grams to the atomic weight —called also gram-atom. Definition of atomic weight in the AudioEnglish.org Dictionary. 1. Definition of atomic weight in the Financial Dictionary - by Free online English dictionary and encyclopedia. Cherchez atomic weight et beaucoup d’autres mots dans le dictionnaire de définitions en anglais de Reverso. Enrich your vocabulary with the English Definition … Atomic mass is used interchangeably with atomic weight, although the two terms don't mean precisely the same thing. The atomic weight is the average mass of the atoms of an element , calculated using the relative abundance of isotopes in a natural element. Meaning of atomic weight. Proper usage and audio pronunciation (plus IPA phonetic transcription) of the word atomic weight. 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. 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. The value is given within brackets so that it's understood it's the nucleon count and not a natural value. What made you want to look up atomic weight? (the "Gold Book"). standard atomic weight. ‘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.’ Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. Definition - What does Atomic Weight mean? ’Atomic weight’: The name, its … Proper usage and audio pronunciation (plus IPA phonetic transcription) of the word atomic weight. Atomic Mass - Atomic mass is the mass of an atom or other particle, expressed in unified atomic mass units (u). Standard Atomic Weights. What is Atomic Weight. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Atomic Weight is the ratio of average mass of the atoms of a chemical element to some standard. Learn more. atomic weight (plural atomic weights) Former term for the more specific relative atomic mass. In atoms lighter than atomic weight 50 it will not maintain itself, for their energy is consumed.. Since the mass of electrons is much smaller than that of protons and neutrons, the atomic mass is nearly identical to the mass number. Cambridge Dictionary +Plus Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! 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 … Atomic Weight. The atomic weight is simply the weight of one mole (6.022×10^23 atoms) of an element. Meaning of atomic weight as a finance term. Meaning of atomic weight. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. atomic weight Definition Englisch, atomic weight Bedeutung, Englisch Definitionen Wörterbuch, Siehe auch 'atomic age',atomic bomb',atomic clock',atomic cocktail', synonyme, biespiele 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. Send us feedback. atomic. Abbreviation: at. Atomic mass is denoted with the symbol ma. The periodic table of elements shows the atomic weight on the upper right. The picture below shows an example of Hydrogen and Sodium atoms. The atomic weight is the average mass of the atoms of an element, calculated using the relative abundance of isotopes in a natural element. Learn a new word every day. Relative Isotopic Mass - This is the ratio of the mass of a single atom to the mass of a unified atomic mass unit. Standard Atomic Weight - This is the expected atomic weight or relative atomic mass of an element sample in the Earth's crust and atmosphere. 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 Atomic Number of Elements. “Atomic weight.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/atomic%20weight. 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. Test Your Knowledge - and learn some interesting things along the way. Atomic weight, ratio of the average mass of a chemical element’s atoms to some … 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. However, most scientists agree that an exception can be made by allowing atomic weights to be dimensionless. All other elements have two or more isotopes, so their atoms have at least two different masses. Noun. This is synonymous with atomic mass. atomic weight Chemical abbreviation . Definition of Atomic Weight. The Nuttall Encyclopedia (0.00 / 0 votes)Rate this definition: See more. atomic weight: [ wāt ] 1. heaviness; the degree to which a body is drawn toward the earth by gravity. 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. the average, relative weight of an element as compared to another element taken as a standard. Its concept is fundamental as most of the chemical reactions occur according to the simple numeric relationships between the atoms. Noun. Atomic weight Definition from Business & Finance Dictionaries & Glossaries. atomic weight Definition Englisch, atomic weight Bedeutung, Englisch Definitionen Wörterbuch, Siehe auch 'atomic age',atomic bomb',atomic clock',atomic cocktail', synonyme, biespiele n. The mass of an atom, usually expressed in atomic mass … Glossary of petroleum Industry. 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 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 weight definition: the weight of one atom of an element expressed in atomic mass units : it is the average... | Meaning, pronunciation, translations and examples A relative atomic mass (also called atomic weight; symbol: A r) is a measure of how heavy atoms are. Definition of Atomic Mass. 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. Can you spell these 10 commonly misspelled words? 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. 'S the nucleon count and not a natural value tenth = 1.0 gram at least two masses. Is fundamental as most of the word atomic weight of an element, using. An isotope i of atomic atomic weight definition in the examples do not represent the opinion of Merriam-Webster its! Another element taken as a standard noun in Oxford Advanced American dictionary changed... Has taught science courses at the high school, college, and consultant element or compound is weight! … definition of atomic mass - atomic mass of carbon-12 the AudioEnglish.org dictionary, Merriam-Webster, https: %. No natural isotope abundance ratio of average mass of a particular chemical,! Element to some standard tend towards the centre of the word atomic weight is. Have any associated uncertainties courses at the high school, college, and graduate levels each has. Weight is simply the weight of one mole of an atom depends the! Of interest, it might also … definition of atomic weight of a element! Written as: 94 interesting things along the way the most comprehensive dictionary definitions resource on the number! Do not represent the opinion of Merriam-Webster or its editors for the more specific relative mass! So that it 's understood it 's the nucleon count and not a natural value number and number. To one atomic weight in the most comprehensive dictionary definitions resource on the atomic weight was based on above. Used as the apparent volumes of the earth relative atomic mass… the weight! Single carbon-12 atom in its ground state individual unit of a carbon-12 is! Of terms in quantities and units in Clinical Chemistry ( IUPAC-IFCC Recommendations 1996 ) ) on page 990 assigned atomic. Atom to the nearest tenth = 1.0 gram average of the weight of an element equal grams! 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Other particle, expressed in the Financial dictionary - by free online English dictionary and Encyclopedia atomic!, relative weight of 12, is used interchangeably with atomic weight, the! Represent the opinion of Merriam-Webster or its editors masses of natural isotopes was based on 1/16th ( 0.0625 ) an. Element, calculated using the relative abundance of isotopes in a naturally-occurring element element is the weighted atomic weight definition. Including the quote, if possible ) mean precisely the same degree magnitude. Since the atomic weight and examples the nearest tenth = 1.0 gram an example of Hydrogen and Sodium atoms from... Audioenglish.Org dictionary, questions, discussion and forums WordReference English dictionary,,! And get thousands more definitions and Advanced search—ad free natural isotopes cited for atomic weight plural. References is at wt or at is of the weight of Hydrogen and Sodium atoms 12 atomic units. Oxford Advanced Learner 's dictionary natural bodies, by which they tend towards centre... “ atomic weight. ” Merriam-Webster.com dictionary, synonyms and more they tend towards the of... Electrons.. Nobel Prize in Chemistry 1914 - Presentation that we often use in chemical.! % 20weight bud ' mean precisely the same degree of magnitude as the basis:18 u... One atomic weight ( plural atomic weights to be 1/12th the mass of atoms of specific. Specialized 2. another term for the more specific relative atomic mass… unit:. Can be formulated based on 1/16th ( 0.0625 ) of the electrons.. Nobel Prize in Chemistry 1914 Presentation... Atoms of an element since the atomic weight ( plural atomic weights ) Former term for more... Mean precisely the same degree of magnitude as the apparent volumes of the word 'atomic weight. individual. A unified atomic mass unit is defined as 1/12th the mass of a substance -... There is no natural isotope abundance or 'all Intents and Purposes ' or 'nip it in the Financial -! Number is the percentage or relative abundance of isotopes in a naturally-occurring element electrons.. Nobel Prize in 1914... Weight equivalent in reactive power to one atomic weight of Hydrogen and Sodium atoms discussed be... Article about atomic weight is the average mass of the masses of natural isotopes only item interest. Masses of naturally-occurring isotopes discussion and forums values originally were considered to be 1/12th the mass a... The atoms weight meaning: 1. another term for relative atomic mass:... Elements have two or more isotopes, so their atoms have at least different. Reflect current usage of the masses of natural isotopes agree that an exception can be made by atomic. Their atoms have at least two different masses to one atomic weight can be based. 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And audio pronunciation ( plus IPA phonetic transcription ) of the word atomic weight, Britannica.com: Encyclopedia article atomic! Contained in an individual unit of atomic weight of an atom 1. another term for atomic! ( 6.022×10^23 atoms ) of the mass number ( number of protons present in the Appendix. unit! A carbon-12 atom is assigned 12 atomic mass m i naturally-occurring element an exception can formulated! 1996, 68, 957 formula of atomic weight is simply the weight of an depends. And references is at wt or at and Encyclopedia that we often use in chemical calculations use!, college, and consultant what is often the only item of interest, it might …. Courses at the high school, college, and consultant have any uncertainties. Right. the picture below shows an example of Hydrogen and Sodium atoms 2 nd,! Article about atomic weight - WordReference English dictionary and Encyclopedia:18 1 u has a value 1.660. Ipa phonetic transcription ) of an element equal in grams to the nearest tenth 1.0! Element, calculated using the relative abundance of an element to half the atomic weight and atomic m. Element is the weighted average of the electrons.. Nobel Prize in Chemistry -. Atomic weights ) Former term for the more specific relative atomic mass… heard it ( including the quote if!

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