Question

what is atomic mass?​

Answer 1

atomic mass can be defined as the total number of protons and neutrons contained in an atom.

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Answer 2

It is defined as the average relative mass of an atom of an element or air to the mass of an atom of carbon -12 taken as 12.

Atomic mass = $\frac{mass\:of\:an\:atom} {1/12\:mass\:of\:a\:carbon\:atom }$