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Identify the least stable ion amongst the following :

$(A)\;Li \\ (B)\;Be^{-} \\(C)\;B^{-} \\(D)\;C^{-} $
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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.
answered Apr 4, 2014 by meena.p

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