Question
Second ionisation potential of $Li, Be, B$ is in the order
✓
Answer
b
$\mathop {Li}\limits_{1{s^2}} \,\mathop {B{e^ + }}\limits_{2{s^1}} \,\mathop {{B^ + }}\limits_{5{s^2}} \, \Rightarrow \,Be\, < \,B\, < Li$
$\mathop {Li}\limits_{1{s^2}} \,\mathop {B{e^ + }}\limits_{2{s^1}} \,\mathop {{B^ + }}\limits_{5{s^2}} \, \Rightarrow \,Be\, < \,B\, < Li$
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