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For a nucleus to be stable, the correct ...

For a nucleus to be stable, the correct relation between neutron number `N` and proton number `Z` is.

A

`NgtZ`

B

`N=Z`

C

`NltZ`

D

`NgeZ`

Text Solution

Verified by Experts

The correct Answer is:
D
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In most stable nuclei neutron number N and proton number Z has the relation

A : During radioactive disintegration an alpha -particle and a beta -particle do not emit simultaneously from any nucleus. R : An alpha -particle emits from a nucleus when the N/Z ratio is less than the stability range (where N=number of neutrons and Z=number of protons in a nucleus. )

Staements I: Light nuclei are most stable if N =Z, while heavy nuclei are more stable if N gtZ. (N rarr number of neutrons, Z rarr number of protons) Staements II: As the number of protons increases in a nucleus, the Coulomb's repulsive forece increases, which tends to break the nucleus apart. So, to keep the nucleus apart. So, to keep the nucleus stable, more number of neutrons are needed which are neutral in nature.