Successive ionization energies data of a 3rd period elements in eV/atom isIE1IE2IE3IE4IE5IE6IE7IE8IE910.4917.7730.2051.4465302220.42309.60372424.4The group number of the element in long form of periodic table [as per 1 – 18 convention] is______.

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Successive ionization energies data of a 3rd period elements in eV/atom is
IE₁ IE₂ IE₃ IE₄ IE₅ IE₆ IE₇ IE₈ IE₉
10.49 17.77 30.20 51.44 65302 220.42 309.60 372 424.4
The group number of the element in long form of periodic table [as per 1 – 18 convention] is______.

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answer is 14.

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There is drastic jump in IE for the 5^th ionization. So the element has 4 valence electrons and hence it must belong to group 14.

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IE₁	IE₂	IE₃	IE₄	IE₅	IE₆	IE₇	IE₈	IE₉
10.49	17.77	30.20	51.44	65302	220.42	309.60	372	424.4