Why does nitrogen have a higher ionization energy than carbon?

Oxygen has low ionisation energy (than that of nitrogen). It is due to an electron being added to an already half full orbital in oxygen, which results in electron electron repulsion, which will lower the ionisation energy. read more

Because nitrogen has a larger nuclear charge and smaller atomic radius. Nitrogen is to the right of carbon on the periodic table. The general trend is that first ionization energy increases from the left to right of a period. read more

nitrogen has higher ie than oxygen because of thd half filled p-orbital ie. 1s2 2s2 2p6 hence more enery is required to remove the electron from the orbital nitrogen has more ie than carbon because as we move along a period the ie increase becausean.electron is added to the valence shell. read more