Question

The decreasing order of ionization potential of elements Ne Cl P S Al Mg is?

Answer 1

Answer:

You need to look at the periodic table. First look at the period number for the different elements and then the group.

First thing we see is they are all in period 3.

Na - Group 1

Mg -Group 2

Al - Group 13

P - Group 15

Ar - Group 18

The effective nuclear charge increases with group number. The effective nuclear charge increases because the outmost shell electrons (valence electrons) do not shield the increasing nuclear charge as effectively as core electrons.

So the energy required to remove an electron (the first ionization energy) will be largest for Ar and smallest for Na.

Ar>P>Al

and

Mg>Na

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