JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Analyzing +4 | -1

The first four ionisation enthalpies of an element are 191, 678, 872,

6982 \,\mathrm{K} \,\mathrm{cal} \,\mathrm{mol}^{-1}

respectively. The number of valence electrons in the element is

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Correct option: C

Option C (3) is correct because there is a large jump in ionization enthalpy between the 3rd and 4th ionization, indicating 3 valence electrons.

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