Question

why atomic mass of these exception atomic masses are not double of its atomic number​

Answer 1

Answer:

If there were no isotopes and all elements had a number of neutrons equal to the number of protons, then atomic mass would be approximately twice the atomic number. (This is only an approximation because protons and neutrons don't have exactly the same mass, but the mass of electrons is so small that it is negligible

Answer 2

Answer:

Atomic number is the number of protons in an atom and atomic mass is the mass of protons, neutrons, and electrons in an atom.

Explanation:

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