Of the following. which element has the highest first ionization energy?

Of the following, which element has the highest first ionization energy? Of the following, which element has the highest first ionization energy?

Al
Cl
Na
P

Answer

Cl

Out of Al,P,Cl and Na Cl has the highest Ionisation Energy . This is because as we move from left to right in th periodic table, the I .E increases with atomic numbers.This is due to increase in nuclear charge and decrease in atomic radius as a result the electrons are held tightly and difficult to remove.So much energy is required.

Also as we move down the group the atomic size decrases and hold of electrons by nucleus becomes less.So less energy is required

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