What do the different colour heart emojis mean? Does a red , yellow , green , blue and violet emoji all mean the same thing according to you? Solitude4
1 The relative atomic mass, or atomic weight, of an element is the weighted average of the masses of the isotopes in the naturally occurring element relative to the mass of an atom of the carbon-12 isotope which is taken to be exactly 12.
atomic mass noun [C or U]. âº the âmass of a âspecific âisotope of a âparticular âchemical âelement, usually âexpressed in âatomic âmass âunits Compare relative atomic mass. Compare. relative atomic mass. (Definition of atomic mass from the Cambridge Advanced Learners Dictionary & Thesaurus Â© Cambridge University Press).