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average atomic weight

См. также в других словарях:

  • Atomic 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

  • atomic 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

  • atomic 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

  • atomic 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

  • atomic weight — atom′ic weight′ n. chem. the average weight of an atom of an element, based on 1/12 the weight of the carbon 12 atom Abbr.: at. wt …   From formal English to slang

  • atomic weight — noun Date: 1820 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 see element table …   New Collegiate Dictionary

  • Atomic mass — The atomic mass (ma) is the mass of an atom, most often expressed in unified atomic mass units. [GoldBookRef|file=A00496|title=atomic mass] The atomic mass may be considered to be the total mass of protons, neutrons and electrons in a single atom …   Wikipedia

  • Atomic number — See also: List of elements by atomic number An explanation of the superscripts and subscripts seen in atomic number notation. In chemistry and physics, the atomic number (also known as the proton number) is the number of protons found in the… …   Wikipedia

  • atomic mass — noun a) The mass of an atom. b) atomic weight; the average mass of atoms of an element …   Wiktionary

  • Atomic orbital — The shapes of the first five atomic orbitals: 1s, 2s, 2px, 2py, and 2pz. The colors show the wave function phase. These are graphs of ψ(x,y,z) functions which depend on the coordinates of one electron. To see the elongated shape of ψ(x,y,z)2… …   Wikipedia

  • weight — The product of the force of gravity, defined internationally as 9.80665 m/s2, times the mass of the body. [A.S. gewiht] apothecaries w. an obsolescent system of weights based upon the w. of a grain of wheat. Has been used for centuries in… …   Medical dictionary

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