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Which of the following atoms has the low...

Which of the following atoms has the lowest ionisation potential?

A

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

B

`""_(55)^(133)"Cs"`

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
B
In `""_(55)^(133)Cs`, the outermost electron if farthest from the nucleus and so minimum energy is required to remove this electron from the atom. Hence `""_(55)^(133)Cs` has lowest concision potential.
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