The five successive ionization enthalpies of an element are 800, 2427, 3658, 25024 and $32824\mathrm{k}\mathrm{J}{\mathrm{m}\mathrm{o}\mathrm{l}}^{-1}$ . The number of valence electrons in the element is:

<p>As difference in <span class="mathml" contenteditable="false"> <math> <msup> <mrow> <mrow> <mn>3</mn> </mrow> </mrow> <mrow> <mrow> <mtext>rd</mtext> <mtext>&nbsp;</mtext> </mrow> </mrow> </msup> </math> </span> and <span class="mathml" contenteditable="false"> <math> <msup> <mrow> <mrow> <mn>4</mn> </mrow> </mrow> <mrow> <mrow> <mtext>th</mtext> <mtext>&nbsp;</mtext> </mrow> </mrow> </msup> </math> </span>&nbsp;ionisation energies is high so atom contains 3 valence electrons</p>

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