1.

The first ionzation enegry of oxygen is less than that of nitrogen. Which of the following is the correct reason for this observation?A. Higher electronegative of oxygen than nitrogenB. Greater effective nuclear charge of oxygen then nitrogenC. Lesser atomic size of oxygen than nitrogenD. Greater inter electrobn repulsion between two electrons in the same `p`-orbital conunterbalances the increase in effective nuclear charge on moving from nitrogen to oxygen

Answer» Correct Answer - D
Another reason is that after losing one of the `p` electrons, oxygen acquires stability in the form of excatly halffull `p `subshell:
`O(1s^(2)2s^(2)2p^(4))rarr O^(+) (1s^(2)2s^(2)2p^(3))+e^(-)`


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