Prove that ionization energy is a periodic property?

1.	Prove that ionization energy is a periodic property?
Answer» Variation in a period: On moving across a period from left to right, the ionization enthalpy value increases. This is due to the following reasons: 1. Increase of nuclear charge in a period 2. Decrease of atomic size in a period Because of these reasons, the valence electrons are held more tightly by the nucleus, thus ionization enthalpy increases. Hence, ionization energy is a periodic property. Variation in a group: As we move from top to bottom along a group, the ionization enthalpy decreases. This is due to the following reasons: 1. A gradual increase in atomic size 2. Increase of screening effect on the outermost electrons due. to the increase of number of inner electrons. Hence, ionization enthalpy is a periodic property.

Answer»

Variation in a period:

On moving across a period from left to right, the ionization enthalpy value increases.

This is due to the following reasons:

1. Increase of nuclear charge in a period

2. Decrease of atomic size in a period

Because of these reasons, the valence electrons are held more tightly by the nucleus, thus ionization enthalpy increases. Hence, ionization energy is a periodic property.

Variation in a group:

As we move from top to bottom along a group, the ionization enthalpy decreases.

This is due to the following reasons:

1. A gradual increase in atomic size

2. Increase of screening effect on the outermost electrons due. to the increase of number of inner electrons.

Hence, ionization enthalpy is a periodic property.

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