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It has to do with the fact that when you add an electron to C, it goes in the 3rd P subshell (previously unoccupied). When you add an electron to N, it has to pair up with another electron in the p shell. The energy released in the C case is larger.
In its ground state, C has one electron in the px orbital and one electron in the py orbital and an unoccupied pz orbital. When an e- is added, it occupies the previously empty p orbital, which releases more energy than an additional e- in N pairing up with another in the px orbital.
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