Atoms of the same element are identified by the same number of protons.
Nuclei that contain the same number of protons, but a different number of neutrons, are known as isotopes
The ratio of number of neutrons to the number of protons in a nucleus may indicate nuclear stability. Unstable isotopes undergo radioactive decay.
Those with 1:1 ratio are found to be stable. Nuclei having more protons than neutrons tend to be unstable.
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