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Q.

Configuration that shows the highest energy released when an electron is added to the atom is

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a

1s2 2s2 2p3

b

1s2 2s2 2p4

c

1s2 2s2 2p5

d

1s2 2s2 2p6

answer is C.

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Detailed Solution

In case of option(C), by the addition of electron it acquires noble gas configuration.

Hence it releases more energy.

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