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Q.

Noble gases & alkali earth metals having 1st electron affinity values are____ 

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a

Exoergic

b

Endoergic

c

None

d

Both A & B

answer is B.

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Detailed Solution

The addition of second electron in an anion is more difficult and energy is needed to overcome the repulsion forces between negatively charged atomic sphere and the valence electron.  This energy being greater than energy released during gaining up of electron. i.e., why higher EA values (EA2 , EA3 )  are Endoergic nature

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