Question

Identify the least stable ion amongst the following.

• A. $L{i}^{+}$
• B. $B{e}^{-}$
• C. $B^{-}$
• D. $C^{-}$

Answer 1

The correct option is B

$B{e}^{-}$

$B{e}^{-}$ is the least stable ion, Be $\left(1s^{2}2s^2\right)$ has stable electronic configuration, addition of electron decreases stability.