the atomic weight

  • 1atomic weight — Chem. 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 the weight of an oxygen atom, but after 1961 based on 1/12 the weight of the carbon 12 atom. Abbr.: at. wt. [1820 30]… …

    Universalium

  • 2Atomic weight — (symbol: A sub|r) is a dimensionless physical quantity, the ratio of the average mass of atoms of an element (from a given source) to 1/12 of the mass of an atom of carbon 12.cite journal | author = International Union of Pure and Applied… …

    Wikipedia

  • 3Atomic weight — Weight Weight, n. [OE. weght, wight, AS. gewiht; akin to D. gewigt, G. gewicht, Icel. v[ae]tt, Sw. vigt, Dan. v[ae]gt. See {Weigh}, v. t.] [1913 Webster] 1. The quality of being heavy; that property of bodies by which they tend toward the center… …

    The Collaborative International Dictionary of English

  • 4Atomic weight — Atomic A*tom ic, Atomical A*tom ic*al, a. [Cf. F. atomique.] 1. Of or pertaining to atoms. [1913 Webster] 2. Extremely minute; tiny. [1913 Webster] {Atomic bomb}, see {atom bomb} in the vocabulary. {Atomic philosophy}, or {Doctrine of atoms}, a… …

    The Collaborative International Dictionary of English

  • 5atomic weight — n the mass of one atom of an element specif the average mass of an atom of an element as it occurs in nature that is expressed in atomic mass units see ELEMENT (table) * * * the sum of the masses of the constituents of an atom, either that of a… …

    Medical dictionary

  • 6atomic weight — n. Chem. the weight of one atom of an element expressed in atomic mass units: it is the average weight of all the isotopes of the element …

    English World dictionary

  • 7gram-atomic weight — noun the quantity of an element whose weight in grams is numerically equal to the atomic weight of the element • Syn: ↑gram atom • Hypernyms: ↑metric weight unit, ↑weight unit * * * noun see gram atom * * * gram atˈom or …

    Useful english dictionary

  • 8gram-atomic weight — noun Date: 1927 the mass of one mole of an element equal in grams to the atomic weight called also gram atom …

    New Collegiate Dictionary

  • 9atomic weight — noun a) Former term for the more specific relative atomic mass. The equivalent weight of an element or compound is that weight equivalent in reactive power to one atomic weight of hydrogen. b) A term used to represent the mean relative atomic… …

    Wiktionary

  • 10atomic weight — noun (chemistry) the mass of an atom of a chemical element expressed in atomic mass units • Syn: ↑atomic mass, ↑relative atomic mass • Topics: ↑chemistry, ↑chemical science • Hypernyms: ↑ …

    Useful english dictionary