Question

Identify the least stable ion amongst the following.

• A. $Li^+$
• B. $Be^-$
• C. $B^-$
• D. $C^-$

Answer 1

Answer: (B)

$Be^-$

Answer 2

$Be^-$ is the least stable ion. $Be (Is^22s^2)$ has stable electronic configuration, addition of electron decreases stability.