Arrange the elements N, P, O and S in the order of-

(i) increasing first ionisation enthalpy.

(ii) increasing non-metallic character.

Give reason for the arrangement assigned.

Answers (1)

(i) S < P < N < O

(ii) P < S < N < O

The ionisation enthalpy increases on moving from left to right in a period, and similarly Non-metallic character increases while moving from left to right across the period.

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