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Q)

Identify the least stable ion amongst the following :

$(A)\;Li \\ (B)\;Be^{-} \\(C)\;B^{-} \\(D)\;C^{-}$

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A)
The electronic configuration of $Be^{-}$ is $1s^22s^2 2p^1.$
So it will loose an electron to get stability.
Hence B is the correct answer.