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Question

First four ionization energy values of an element are 191, 578, 872 and 5972 Kcals. The number of valence electrons in the element is
  1. 4
  2. 3
  3. 1
  4. 2


Solution

The correct option is B 3
Sudden jump in IE3 and IE4 show that, it acquires stable configuration after loosing 3 valence electrons, therefore it valency is three.

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