Question

What change can be observed when the value in the arrangement is opened ? Why ?
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Answer 1

Answer:

The electron gain enthalpy of chlorine is more than fluorine because in it the added electron goes to the smaller energy level (n=2) and hence suffers significant repulsion from the electrons already present in this shell.

First ionisation enthalpy of Nitrogen is more than oxygen due to half filled p orbital which makes the nitrogen more stable.