Define Ionization energy .

Explanation

Ionization energy : The energy required to remove an electron from the outermost orbit or shell of a neutral gaseous atom is called ionization energy .
Factors charge : As nucleous energy :
1 ) Nuclear charge : As Nuclear charge increases , ionizaton energy increases .
2) Screening effect or shieling effect : More the Screening effect. Less is ionization energy .
3 ) Penetrating power of the orbitals : if the orbitals have less penetratting power , then the ionization energy is less . Generally , the pentrating power of orbits are like this : s gt p gt d gt f .
4 ) Stable configuration : The elements having half - filled or compleetely filled orbitals have more when when the element has stable configuration
5 ) Atomic size : As the atomic size increaese , the nucleus attraction over outermost electron decreses . SO ionization energy decreases .