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AS it has high nuclear charge means high no. of proton so in order to remove one elecrton it require high amout of energy that why?
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In the electronic configuration of nitrogen we found that there are 2 electrons present in the 1s orbital and 2 electrons present in the 2s orbital. But in case of 2p orbital there are only 3 electrons present i.e. it is half filled (condition for full filled is 6). This type of half filled orbitals are very much stronger than any other configuration( like oxygen has 4 electrons in its 2p orbital ) and more amount of energy is required to remove an electron from 2pz subshell of 2p orbital. So nitrogen has the higher I.E. than oxygen.
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