Question

The set representing the correct order of first ionisation potential is

• A. $K>Na>Li$
• B. $Be>Mg>Ca$
• C. $B>C>N$
• D. $Ge>Si>C$

Answer 1

Answer: (B)

The first ionisation potential $(I{E}_1)$ decreases from top to bottom in a group. Hence, the order of ionisation potential is as:
$Be>Mg>Ca$