Question

The correct order of $I{P}_1$ is

• A. Li < Be < B < C
• B. Li < B < Be < C
• C. Li < B < C < Be
• D. Li < B < Be = C

Answer 1

The correct option is B

Li < B < Be < C

Ionisation potential increases from left to right in a period,

$I{P}_1$ of Be > B due to stable $2s^2$configuration of Be