Question

Atomic Mass is the ___________ of the mass numbers of all the isotopes of an element.

Answer 1

Answer:

Number of proton + No of electron

Explanation:

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Answer 2

Answer:

No of neutron + no of protons

Explanation:

Since atomic mass is the sum total of the neutron and mass number then we can say that, neutron number plus proton number is the mass number of all isotopes.