We have the number of outer shell valence electrons of 4 atoms. Which among them will have the least electron affinity?
Atom 1: 7
Atom 2: 2
Atom 3: 6
Atom 4: 3

ns2np5

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ns2np2

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ns2np3

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ns2np4

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Solution

The correct option is B
ns2np2

Atoms which can lose electrons to gain octet configuration will have the least electron affinity, since adding an electron will only make it harder for the atom to form an octet. Atoms which require electrons to complete their octet will have a higher electron affinity.

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