The first five ionization energies of an element are `801,2428,3660,25030,32835 "in" "kJ"//"mol"`. Then the element could be.

Ionization energy of an element is:

The first ionization energies of group 16 elements

Ionization energy of an element depends on :

The first three successive ionisation energies of an element X are 520, 7297 and 11810 kJ mol^(-1) respectively. The element X belongs to