Question

which has greater ionisation potential Nitrogen and phosphorus and explain​

Answer 1

Answer:

Well, it is for the same reason nitrogen atom has a higher first ionization energy than oxygen atom. Since the 3p electrons in sulfur (that sulfur would lose) are paired, sulfur has more electron repulsion in those orbitals than phosphorus does, so it takes less energy input to remove an electron from sulfur.

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Answer 2

Nitrogen,because down the group atomic radius increases and ionisation energy decreases
So,N>P in ionisation energy.