Atomic mass is

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masses of their all constituent particles

Is the average mass of the atoms

masses of their constituent protons

Is the average number of the atoms

answer is D.

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Detailed Solution

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass units (AMU, also known as daltons, D). The atomic mass of atoms, ions, or atomic nuclei is slightly less than the sum of the masses of their constituent protons, neutrons, and electrons,

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