Question

Why ionization energy fall in Aluminum and sulphur in same group

Answer 1

Answer:

So the extra amount of protons means the nucleus holds the outer electrons more strongly so it requires more energy to remove an electron. Aluminium has lower ionization energy than Magnesium. This is unexpected as Al has more protons. ... However, sulfur has 4 electrons so one of them must pair in a subshell.

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