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Q.

Which of the following trends of electron affinity are correct?

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a

O>S>Se

b

Cl>Br>I

c

O>C>N

d

Cl>F>Br

answer is B, C, D.

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Detailed Solution

Electron affinity increases as we move from left to right in a period and decreases on moving down a group. However there are many exceptions.  The following graph shows the plot of E.A. values against atomic number for some elements.

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From the graphs we can see that (2), (3), (4) are correct, (1) is incorrect. E.A. of S > O

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