Identify least stable ion among the foll...

Identify least stable ion among the following ?

A

`Li^(-)`

B

`Be^(-)`

C

`B^(-)`

D

`C^(-)`

Verified by Experts

The correct Answer is:

B

`Be(1s^(2)2s^(2))` due to its fully filled 2s-subshell has least tendency to take up an electron . As such `Be^(-)` is least stable.

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