Question

The element from the elements C,O,N,F, having a lower nuclear charge​

Answer 1

Explanation:

Shielding increases as number of shells increases, so elements that are at the bottom of group are most shielded and would have lowest effective nuclear charge. Therefore in group 1, Francium (Fr) has lowest effective nuclear charge.

Answer 2

Explanation:

Shielding increases as number of shells increases, so elements that are at the bottom of group are most shielded and would have lowest effective nuclear charge. Therefore in group 1, Francium (Fr) has lowest effective nuclear charge.