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Atomic weight

Atomic weight



(1)   (chemistry) the ratio of the atomic mass of an element to half the atomic mass of carbon


  1. Former term for the more specific relative atomic mass.
    • 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.
  2. 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.