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Q. Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has:
Answer: stable half filled 2p sub level
Notes: Ionization energy is a measure of the ease in which atoms lose electrons and become positive ions. The 1S2.2S2.2P2 configuration in nitrogen is more stable than 1522522P4 due to half filled p-sublevel. Hence nitrogen, N atom has greater ionization energy than oxygen, O atom.

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