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The first four ionization energies of an...

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.

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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.
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