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Define atomic mass of an element....

Define atomic mass of an element.

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Atomic mass: Atomic mass is defined as how many times an atom of an element is heavier than 1 a.m.u.
Atomic mass of an element `= ("Mass of an atom")/((1)/(12)th "mass of an atom of carbon"(C-12))`
For example, atomic mass of Na= 23.5 a.m.u. It means that Na atom is 23.5 times heavier than `(1)/(12)th` of mass of carbon atom `(C-12)`.
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