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Q.

Arrange N, O, and S in order of decreasing electron affinity

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a

S>N>O

b

N>O>S

c

S>O>N

d

O>S>N

answer is A.

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Detailed Solution

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  • Electron affinity increases as you add more valence electron. That puts oxygen (O) as having more electron affinity than (N). So, O>N
  • Electron affinity would typically decrease move down the periodic table.
  • But there is a factor in the second period of elements due to the close distance or the orbital from the nucleus so that repulsion of an electron from each other reduce electron affinity.
  • So, the order is S > O > N. 
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