The five successive energies of an element are `800, 2427, 3658, 25024` and `32824 kJ mol^(-1)`

The five successive energies of an element are `800, 2427, 3658, 25024` and `32824 kJ mol^(-1)`

The five successive energies of an element are `800, 2427, 3658, 25024` and `32824 kJ mol^(-1)` respectively. The number of valence electron is