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CGPET 2017 Solved Paper

Section: Chemistry
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Question : 85 of 150
 
Marks: +1, -0
The first four ionisation enthalpy values of an element are 191k cal mol−1,578k cal mol−1,872 kcal mol−1 and 5962 kcal mol−1. The number of valence electrons in the element is
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