1. Tardigrade
  2. Question
  3. Chemistry
  4. 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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Q. 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

Haryana PMTHaryana PMT 2011

Solution:

The number of valence electrons in the element is three since the IV th IE is very high i.e., the fourth electron is to be removed from stable configuration.