Question

The first ionisation enthalpy of nitrogen (Z = 7) is greater than that of oxygen (Z = 8) but

the reverse is true for the second ionisation enthalpy. Explain why.​

Answer 1

Answer:

nitrogen has stable configuration that is half filled p orbital....but for oxygen...has one electron more....so...in the first IP we can't disturb the stable configuration of nitrogen...

but in second IP oxygen have...half filled p orbital becoz...of loosing one electron in IP1

so... IP 2 of oxygen is stronger than nitrogen....

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Answer 2

Explanation:

this is for the first case of ip but in the second case of ip oxygen release 1 electron and become half filled and on the other hand nitrogen become partially filled.... that is why oxygen is stronger then nitrogen..

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