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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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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

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Correct option: C

Option C (3) is correct because the large jump in ionization energy between the third and fourth ionization energies indicates that there are 3 valence electrons.

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