Question

why nitrogen has 0 electron affinity​

Answer 1

because it has 0 valency

Answer 2

Half filled configuration in Nitrogen has gives stability to it, thus its electron affinity is Zero. Electron affinity of Nitrogen is zero due to its half-filled configuration of 2p-orbital, which gives stability to it.

Since the electronic configuration of nitrogen is 2s2 2p3, it has a half filled p shell which is a stable configuration. Thus, it has a relatively low tendency to gain or lose electrons and its electron gain enthalpy is zero.

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