The first ionisation energies of the elements of group 14 follow the order.

The first ionisation energies of the elements of the transition series

The first ionisation energies of the elements of the transition series.

The first ionisation energies of the elements of the transition series.

The first ionisation energies of the elements of the first transition series (TitoCu)

The first ionisation energies of the elements of the first transition series (TitoCu)

The dominating factor responsible for the decreasing ionisation energies of the elements on moving down the group is :

The dominating factor responsible for the decreasing ionisation energies of the elements on moving down the group is :