Question

Least ionisation potential will be of :

(1) Be3 (2) H (3) Li+²(4) He+​

Answer 1

Explanation:

H+

becoz it don't have free electrons to donate

Answer 2

Answer:

Correct option is

B

H

Be

3+

, H, Li

+2

and He

+

are isoelectronic species.

All of these contain 1 electron. The effective nuclear charge is minimum for H. Hence, least ionisation potential will be of H.