Electronic configurations of four elements A, B, C and D are given below :
(A) 1s2 2s2 2p6
(B) 1s2 2s2 2p4
(C) 1s2 2s2 2p6 3s1
(D) 1s2 2s2 2p5
Which of the following is the correct order of increasing tendency to gain
electron :
(1) A < C < B < D
(2) A < B < C < D
(3) D < B < C < A
(4) D < A < B < C

Answer: Option 1
(A) 1s22s22p6
Total electrons: 2 + 2 + 6 = 10 It is an electrical configuration made up entirely of group 18 element Neon. The electron gain enthalpy of this element is positive.

The electrical arrangement is for the element oxygen, which is in group 16. High negative electron gain enthalpy is present in this element.

(C) 1s22s22p63s1
The group 1 element, sodium, has the following electrical configuration. Low negative electron gain enthalpy characterises this element.

The group 17 element fluorine has the following electrical arrangement. Among the given configurations, this element has the highest negative electron gain enthalpy.

As a result, for the above configurations, the increasing order of electron gain enthalpies is: A < C < B < D.

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