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Q.

Which of the following configurations represents atoms of the elements having the highest second ionisation energy

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a

1s22s22p1

b

1s22s22p6

c

1s22s22p63s1

d

1s22s22p63s2

answer is C.

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Detailed Solution

Because for removing second electron, it has to be taken out from stable configuration that needs a large amount of energy.
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