Ease of formation of the cation is favoured by

Lower the value of ionisation potential, higher will be the ease of formation of the cation. Ionisation enthalpy (IE) The minimum amount of energy required to remove an electron from an isolated gaseous atom (X) in its ground state is called the ionisation enthalpy.X(g)⟶X+(g)+e−,ΔiH=+veHence, lower value of ionisation enthalpy indicates that the formation of cation is more favoured.