The five successive ionization enthalpies of an element are 800, 2427, 3658, 35024 and 32824 kJ mol–1. The number of valence electrons in the element is: (A) 4 (B) 3 (C) 5 (D) 2

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Question

The five successive ionization enthalpies of an element are 800, 2427, 3658, 35024 and 32824 kJ mol–1. The number of valence electrons in the element is:

(A) 4
(B) 3
(C) 5
(D) 2

Prashant Kotian · Accepted Answer

Correct answer: B. As difference in 3rd and 4th ionisation energies is high so atom contains 3 valence electrons.

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