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    the successive ionization energies for element X is given as IE1 = 250 KJ/mol, IE2 = 820 kJ/mol, IE3 = 1100 kJ/mol, IE4 = 1400 kJ/mol. find out the number of valence electron for the element X

    There are four ionisation energies given. That means after loosing the 4th electron, noble gas configuration comes. So the valence electron is 4 in number.

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