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