Question

The increasing order of the first ionization enthalpies of the elements B, P, S, and F (lowest first) is :

• A. F < S < P < B
• B. P < S < B < F
• C. B < P < S < F
• D. B < S < P < F

Answer 1

The correct option is D B < S < P < F

Ionization enthalpy increases along the period and decreases down the group. But ionization enthalpy of phoshphorus will be highe than sulphur because of stable half filled configuration.

Hence, option D is correct.