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Out of O and O(2), which one has a great...

Out of O and `O_(2)`, which one has a greater ionisation enthalpy and why?

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O has greater ionisation enthalpy. In `O_(2)`, first electron has to be removed from `pi_(2p_(x))^(**)` orbital, which has higher energy than 2p-orbital of O-atom.
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CHHAYA PUBLICATION-CHEMICAL BONDING AND MOLECULAR STRUCTURE-QUESTIONS-ANSWER ZONE FOR BOARD EXAMINATION
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