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  4. Highest electron affinity among the following is

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Q. Highest electron affinity among the following is

UP CPMTUP CPMT 2007

Solution:

Highest electron affinity among fluorine, chlorine, sulphur and oxygen is o f chlorine
Electron affinities (E.A.) of various elements are
Electron affinity of $F = 332.6 kJ/mol$
Electron affinity of $Cl = 348.5 kJ/mol$
Electron affinity of $S = 200.7 kJ/mol$
Electron affinity of $O = 140.9 kJ/mol$
The low value o f electron affinity of fluorine is probably due to small size of fluorine atom, i.e., electron density is high which hinders the addition of an extra electron