Question

define atomic mass number
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Answer 1

Explanation:

The mass number (symbol A, from the German word Atomgewicht (atomicweight), also called atomic mass number or nucleon number, is the totalnumber of protons and neutrons (together known as nucleons) in anatomic nucleus. ... The mass numberis different for each different isotope of a chemical element.

Answer 2

atomic mass number means the atomic mass of a number

ex

Na2=23×2

=46