A) \[L{{i}^{-}}\]
B) \[B{{e}^{-}}\]
C) \[~{{B}^{-}}\]
D) \[{{C}^{-}}\]
Correct Answer: C
Solution :
\[L{{i}^{-}}=1{{s}^{2}},2{{s}^{2}}\] (In it all sub-shells are saturated so, it is stable) \[B{{e}^{-}}=1{{s}^{2}}.2{{s}^{2}},2{{p}^{2}}\] (very much less stable) \[{{B}^{-}}=1{{s}^{2}},2{{s}^{2}},2{{p}^{2}}\] (less stable) \[{{C}^{-}}=1{{s}^{2}},2{{s}^{2}},2{{p}^{3}}\] (stable due to presence of half-filled 2p-subshell.
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