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CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROP
Question #33940
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Question
Why is the first ionization enthalpy of oxygen lower than that of nitrogen?
A. Oxygen has a half-filled p-subshell
B. The 2p electron in oxygen is more penetrating
C. Two 2p electrons in oxygen occupy the same orbital, leading to increased electron-electron repulsion
D. Nuclear charge is lower in oxygen
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