Answer Posted / Bhawna Bhatia
The mass number (A) of a nucleus refers to the total number of protons and neutrons in an atom's nucleus. It is calculated by adding the atomic number (Z, which represents the number of protons) to the number of neutrons. For example, in carbon-12, Z = 6 (for six protons), and A - Z = 6 (neutrons) = 12. Mass numbers help identify different isotopes of an element.
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