Outermost electronic configurations of four elements A, B, C, D are given below : (A) 3s^ 2 (B) 3s^ 2 3p^ 1 (C) 3s^ 2 3p^ 3 (D) 3s^ 2 3p^ 4 The correct order of fist ionization enthalpy for them is:

JEE Main 2022 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties JEE Main 2022

Outermost electronic configurations of four elements A, B, C, D are given below : (A) (B) (C) (D) The correct order of fist ionization enthalpy for them is:

(1)(A) < (B) < (C) < (D)
(2)(B) < (A) < (D) < (C)Correct
(3)(B) < (D) < (A) < (C)
(4)(B) < (A) < (C) < (D)

Answer: (2)

Solution

The elements are Mg (A), Al (B), P (C) and S (D). Fully filled and half-filled configurations are more stable and need more energy for ionisation, so

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Question ID VK-034301