The first four I.E. values of an element are 284, 412, 656 and 3210 kJ `mol^(-1)`. The number of valence electrons in the element are:

The first ionization energy value of an element area 191, 578,872 and 5692 kcals. The number of valence electrons in the element are

The first four ionization energies of an element are 191, 578, 872 , and 5962 "kca"l . The number of valence electrons in the element is.

The first four ionization energies of an element are 191, 578, 872 , and 5962 "kcal . The number of valence electrons in the element is.

First four ionisation energy values of an element are 191, 578, 872 and 5972 K.Cals The number of valence electrons in the element is

Five successive ionisation enthalpies of an element are 800, 2427, 3638, 25024 & 32824kJ*mol^(-1) respectively. The number of valence electrons of the element is-