Second ionisation potential of Li, Be, B is in the order - Vidyadip

MCQ

Second ionisation potential of $Li, Be, B$ is in the order

A
$Li > Be > B$
✓
$Li > B > Be$
C
$Be > Li > B$
D
$B > Be > Li$

✓

Answer

Correct option: B.

$Li > B > Be$

b
$\mathop {Li}\limits_{1{s^2}} \,\mathop {B{e^ + }}\limits_{2{s^1}} \,\mathop {{B^ + }}\limits_{5{s^2}} \, \Rightarrow \,Be\, < \,B\, < Li$

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