Question

What is meanning of relatve and what is relative atomic masses

Answer 1

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the massif an atom of chemical elements expressed in atomic mass units.it is approximately equivalent to the number of protons and neutrons In the atomic (the mass number) or to the average number allowing for the relative abundance of different isotopes

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Answer 2

A relative atomic mass (also called atomic weight; symbol: Ar) is a measure of how heavy atoms are. It is the ratio of the average mass per atom of an element from a given sample to 1/12 the mass of a carbon-12 atom. Relative atomic mass is the same as atomic weight, which is the older term.