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Atomic nitrogen has a higher ionization ...

Atomic nitrogen has a higher ionization energy than atomic oxygen. This is best explained by:

A

by lower electron-electron repulsion in nitrogen

B

the greater effective nuclear charge of nitrogen

C

the fact that the electron ionized in N is from the 2s subshell, while that ionized from O is from the 2p subshell

D

the fact that N has an odd number of electron while O has an even number.

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The correct Answer is:
A
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