Question

Why don't we consider number of neutrons in a nucleus as the atomic number of an element?​

Answer 1

Answer:

Isotopes are atoms with the same atomic number (atoms of the same element) that have different mass numbers. They have the same number of protons in the nucleus, but the number of neutrons will not be the same. Adding neutrons to an atom will make it heavier, but that won't change the chemistry of the atom..

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