Question

Why nucleus is stable?

Answer 1

In summary it is the balance of protons and neutrons in a nucleus which determines whether a nucleus will bestable or unstable. Too many neutrons or protons upset this balance disrupting the binding energy from the strong nuclear forces making the nucleus unstable.

Answer 2

Unstable Nuclei. ... In summary it is the balance of protons and neutrons in a nucleus which determines whether a nucleus will be stable or unstable. Too many neutrons or protons upset this balance disrupting the binding energy from the strong nuclear forces making the nucleus unstable.