Question

Why the nucleus of atom with even number of protons and neutrons are most stable ?

Answer 1

Stable atoms have low energy states. All nuclei are composed of two basic particles, neutronsand protons. ... Each proton has a positive charge equal in strength to the negative charge carried by an electron. The number of protons in a nucleus is the atomic number (Z) and establishes the chemical identity of the atom.

Answer 2

Nuclides containing odd numbers of both protons and neutrons are the least stable and this means more radioactive. Nuclides containing even numbers of both protons and neutrons are most stable and this means less radioactive. than nuclides containing even numbers of protons and odd numbers of neutrons.