JEE Main Chemistry question

The increasing order of first ionisation enthalpies of the elements B, P, S and F (lowest first) is [AIEEE 2006]

(A)
(B)
(C)
(D)Correct

Answer: (D)

Solution

Approximate values (kJ/mol): B = 801, S = 1000, P = 1012, F = 1681. Phosphorus's half-filled configuration gives it extra stability, raising its IE1 just above sulfur's,

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Question ID VK-133156