# Five successive ionization energies of an element are 800, 2427, 3657, 25024 and 32,824 $\mathrm{kJ} {\mathrm{mol}}^{-1}$ , what is the number of valence electrons

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### Solution:

Fourth ionization energy is increasing Abruptly which shows fourth electron is removed from inert gas core
$\therefore$ The element has three valence electrons

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