The stability of a nucleus is dependent on the neutron - proton ratio. The most stable nucleus is 70 protons, 87 neutrons.
Stability of nuclei
A nucleus will be stable if the neutron proton ratio is less than 1.5 but greater than 1. This range is generally called the band of stability.
Now, we know that the most stable nucleus will have a lower neutron - proton ratio and that is the nucleus contaning 70 protons, 87 neutrons.
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