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Question

The correct order of second ionization potential of carbon, nitrogen, oxygen and fluorine is:-


A

C > N > O > F

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B

O > N > F > C

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C

O > F > N > C

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D

F > O > N > C.

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Solution

The correct option is

C

O > F > N > C
Electronic configuration of element after removal of first electron
O+=1s22s22p3
F+=1s22s22p4
N+=1s22s22p2
C+=1s22s22p1
Second Period: C N O F

The second ionization potential of oxygen is more, as it acquires a half-filled stable electronic configuration so it requires a lot of energy to remove electrons from the oxygen. Hence it has the highest ionization energy.
So, the correct order of second ionization potential is O > F > N > C.


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