The incorrect statement among the following is
The first ionisation potential of Al is less than the first ionisation potential of Mg
The second ionisation potential of Mg is greater than the second ionisation potential of Na
The first ionisation potential of Na is less than the first ionisation potential of Mg
The third ionisation potential of Mg is greater than the third ionisation potential of Al
As we have learnt,
The order of ionisation energy:
This can be explained on the basis of the electronic configuration of the species involved. Fully filled noble gas configuration has greatest ionisation energy while fully filled s orbital configuration also has a higher value of ionisation energy than their or counterpart.
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