The first four ionisation energy values of an element are 191, 578, 872 and 5962 Kcal. The number of valence electrons in the element is
a) 1
b) 2
c) 3
d) 4
 
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There are 3 electron in valence shell since there is a large gap between 3rd and 4th ionisation energy
But 4th ionisation energy is increase abnormally therefor ,the valence electon is 3.
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