Question

What is the nucleon number?

Answer 1

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Nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus.

The mass number is different for each different isotope of a chemical element. This is not the same as the atomic number (Z) which denotes the number of protons in a nucleus, and thus uniquely identifies an element.

Hence, the difference between the mass number and the atomic number gives the number of neutrons (N) in a given nucleus: N=A−Z

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