1.

Identify the least stable ion amongst the following .

Answer»

`Li^(-)`
`Be^(-)`
`B^(-)`
`C^(-)`

Solution :ELECTRONIC configuration of `Li^(-) = 1s^2 , 2s^2` (In it all subshells are COMPLETELY filled, so it is stable)
`Be^(-) = 1s^2, 2s^2, 2p^1` (very less stable, DUE to SINGLE electron no exchange is possible)
`B^(-) = 1s^2, 2s^2, 2p^2` (very less stable, due to single electron no exchange is possible).
`C^(-) = 1s^2, 2s^2, 2p^3` (stable due to presence of half-filled 2p - sub - shell)


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