1. Tardigrade
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  3. Chemistry
  4. The first four ionisation energy value of an element are 190, 580, 590 and 5960 kcal. The number of valence electrons in the element is :

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Q. The first four ionisation energy value of an element are $190, 580, 590 $ and $5960$ kcal. The number of valence electrons in the element is :

Classification of Elements and Periodicity in Properties

Solution:

As there is very high difference between $IE _3 \& IE _4$ thus it has three electrons in its valence shell.