Ionization Energy Trends | Periodic Table – Chemistry

Key Points:

1.What is Ionization Energy

2.Ionization Energy Examples

3.Ionization Energy Units

4.Is ionization Energy endothermic or exothermic reaction

5.Ionization Energy Trends

Ionization Energy is defined as the minimum amount of energy required to remove the outermost electron from isolated, neutral gaseous atom .

This will result in the formation of positively charged gaseous ion (cation).

e.g.

The minimum amount of energy required to remove the outermost electron from isolated, neutral gaseous sodium (Na) atom is known as Ionization Energy . This will result in the formation of positively charged gaseous sodium ion (cation).

Ionization Energy Unit:

  • eV (electron volts)
  • KJ/mol

1 eV = 1.6 X 10 19 J

1 eV / atom = 96 KJ /mol

Ionization Energy ( in Urdu / Hindi)

Is ionization Energy endothermic or exothermic reaction ?

As the ionization process requires an energy input ( absorbed energy ) to remove the negatively charged electron from an atom .Therefore , ionization energy is an endothermic reaction as it absorb energy and enthalpy is always positive .

Ionization Energy Trends across the Period:

It is generally observed that as we move from left to right in a periodic table, the ionization energy increases because the electrons are held tighter by the increase in the effective nuclear charge and the decrease in the atomic size.

Ionization Energy Trends down the Group:

It is generally observed that as we move from top to bottom in a periodic table, the ionization energy decreases because the electron shells increases ,results in the decrease of the effective nuclear charge and the increase in the atomic size.

Factors affecting Ionization Energy ( in Urdu / Hindi)

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