Question

The factors that influence the ionization energy are :

• A. Size of the atom
• B. Charge on the nucleus
• C. The inner electrons which effectively screen the nuclear charge
• D. All of the above.

Answer 1

The correct option is D All of the above.

First we shold understand:

Ionization potential : Energy required to remove an electron from outermost orbit of a gaseous neutral atom.

A) Atomic size(atomic radius):As the atomic size increases ionization potential decreases because less energy is required to remove electron when size is more as electrons are far away from nucleus.

B) The charge on the nucleus:As the charge on the nucleus increases ionization potential increases because it requires more energy when the charge is more on nucleus as nucleus charge attracts the electrons.

C) how effectively the inner electrons screen the nuclear charge(shielding effect): As the shielding effect increases it decreases effective nuclear charge so ionization potential decrease because due to decrease in effective nuclear charge less energy is required to remove electron.

Hence (d) is the correct choice.