Outermost electronic configurations of four elements $A, B, C, D$ are given below:
(A) 3s² (B) 3s² 3p¹ (C) 3s² 3p³ (C) 3s² 3p⁴
The correct order of first ionization enthalpy for them is:

Question

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 (C) 3s 2 3p 4 The correct order of first ionization enthalpy for them is:

TestHub · Accepted Answer

IE ∝ Z eff ​ Also, IE is more than expected for elements having half-filled or fully-filled subshells ∴ 3 s 2 3 p 1 < 3 s 2 < 3 s 2 3 p 4 < 3 s 2 3 p 3 B < A < D < C

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