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The ionisation potential for ...... nucl...

The ionisation potential for ...... nucleus will be minimum.

A

`""_(7)N^(14)`

B

`""_(53)C_(s)^(133)`

C

`""_(18)Ar^(40)`

D

`""_(8)O^(16)`

Text Solution

Verified by Experts

The correct Answer is:
B
The size of `C_(s)` from all the given nuclei will be the highest because radius of nucleus `RpropA^(1/3)` where A = mass number.
Here for given nuclei, radius of `C_(s)` is highest hence at the outermost orbit, the electron are most distant from the nucleus therefore, the binding energy of such electrons is lowest. As a result, to emit electron that is energy of ionisation is lowest so ionisation potential is minimum.
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