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Arrange the elements with the following ...

Arrange the elements with the following electronic configurations in increasing order of electron affinity
(i) `1s^(2)2s^(2)2p^(5) (ii) 1s^(2)2s^(2)2p^(4)`
(iii) `1s^(2)2s^(2)2p^(6)3p^(4) (iv) 1s^(2)2s^(2)2p^(6)3s^(2)3p^(5)`

A

`(ii) lt (iii) lt (i) lt (iv)`

B

`(iii) lt (ii) lt (iv) lt (i)`

C

`(iii) lt (ii) lt (i) lt (iv)`

D

`(iii) lt (ii) lt (i) lt (iv)`

Text Solution

Verified by Experts

The correct Answer is:
A
Electron affinity increases as we move left to right in a period and decreases as we move down in a group.
But electron affinity of Cl is greater than F and that of S is greater than O due to very small size of F and O. As a result, there is a strong inter-electronic repulsion when extra electron is added to these atoms..
(i) `1s^(2)2s^(2)2p^(5) :F`
(ii) `1s^(2)2s^(2)2p^(4) :O`
(iii) `1s^(2)2s^(2)2p^(6)3s^(2)3p^(4) :S`
(iv) `1s^(2)2s^(2)2p^(6)3s^(2)2p^(5):Cl`
Thus correct order is
`Cl gt F gt S gt O`
`(iv) gt (i) gt (iii) gt (ii)`
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