The first four ionization energies of an element are 738 kJ/mole, 1450 kJ/mol, 7700 kJ/mol and 11000 kJ/mol. Identify the periodic group to which this element belongs.

Explanation

It is clearly evident from the given data that the first two ionization energies are comparable where as the third value of 7700 kJ/mol is exceptionally high. This means that such an element must have two valence electrons and shall lie in group 2 (IIA) of the periodic table.