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

The amount of energy required to remove, an electron from the last orbit of an isolated (free) atom in gaseous state is known as ionisation energy or first ionisation of the element. Similarly the energy required for the removal of the electron from the unipositive ion ( M^(+) produced above) is referred to as second ionization energy and thus the third, fourth etc. The ionisation energy depends on various factors like nuclear charge, size of atom, type configurations, screening effect and penetration power of the electrons. The domination factor responsible for the decreasing ionisation energies of the elements of moving down the group is:

The ionisation energy decreases on moving down the group 14. Explain

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

Why does the ionisation energy decrease on going down a group?

How does the ionisation energy of 1st group elements very ?

How does the ionisation energy of 1st group elements very ?

Ionisation energy increases on moving down a group in the periodic table.