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Question

The electronic configurations of four elements are given below. Arrange these elements in the correct order of magnitudes (without sign) of their electron affinities:
i. 2s22p5 ii. 3s23p5
iii. 2s22p4 iv. 3s23p4
Select the correct answer using the codes given below:

A
(i)<(ii)<(iii)<(iv)
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B
(ii)>(i)>(iv)>(iii)
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C
(i)<(iii)<(iv)<(ii)
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D
(iii)>(iv)>(ii)>(i)
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Solution

The correct option is B (ii)>(i)>(iv)>(iii)
i. 2s22p52s22p6
Addition of an electron leads to a stable configuration . So the electron affinity will be high.
ii. 3s23p53s23p6
Electron affinity is higher than (i) because the electron repulsions would be higher in (i) (owing to its small size).
iii. 2s22p42s22p5
Lesser energy will be released than (i) and (ii) because of its electronic configuration (The configuration is not as stable as i).
iv. 3s23p43s23p5
It releases more energy than (iii) and less energy than (ii) (The configuration is not as stable as ii).

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