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  4. The five successive ionization enthalpies of an element are 800, 2427, 3658, 25024 and 32824 kJ mol-1 . The number of valence electrons in the element is :

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Q. The five successive ionization enthalpies of an element are $800, 2427, 3658, 25024$ and $32824\, kJ \,mol^{-1}$ . The number of valence electrons in the element is :

JEE MainJEE Main 2020Classification of Elements and Periodicity in Properties

Solution:

Let suppose element $X \Rightarrow $
$X_{(g)} \xrightarrow[800]{IE_1} X\overset{+}{(g)} \xrightarrow[2427]{IE_2}X\overset{+2}{(g)} \xrightarrow[3658]{IE_3} X\overset{+3}{(g)} \xrightarrow[25024]{IE_4} X\overset{+4}{(g)}\xrightarrow[32824]{IE_5} X\overset{+5}{(g)}$
So valence electrons are 3