The correct order of ionisation energies of 4th period elements Ca,Sc,Ti and V is??
The correct order of ionization energies is as under:-
Ca > V > Ti > Sc
This is because Ca has fully filled 2s2 shell so removal of electron is difficult and therefore has higher ionization energy.
Along the period nuclear charge increases and therefore size decreases and hence removal of electrons becomes difficult resulting increase in the ionization energy.