The first ionisation potential of N, P, O and S are in the order of:
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- N > O > P > S
Moving left to right within a period or upward within a group, the first ionization energy generally increases with a few discrepancies (aluminum and nitrogen group).
Nitrogen group to oxygen group, I.P. decreases instead of increasing because of the stable half-filled configuration of nitrogen family.
N(1400) > O(1313) > P(1011) > S(999)
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