What do you mean by the terms insert pair effect & Ionization Enthalpy?

cbse
p-blockelements

#1

The trend of occurrence of oxidation state two units less than the group oxidation state is called inert pair effect and becomes more prominent as we move down the group.
The minimum amount of energy required to remove the most loosely bound electron from an isolated gaseous atom so as to convert it into a gaseous cation is called its ionization enthalpy(or energy).