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Question

An element X of group 15 exists as a diatomic molecule and combines with hydrogen at 773 K in presence of the catalyst to form a compound, ammonia which has a characteristic pungent smell.

Identify the element X. How many valence electrons does it have?


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Solution

Identification of element X and the number of electrons in the valence shell.

  • It is given that the element X forms Ammonia (NH3).
  • Ammonia is NH3. It contains two elements i.e.; Nitrogen (N) and Hydrogen (H).
  • Hydrogen is a group- 1 element whereas nitrogen is group-15 element.
  • It is given that X is a group-15 element, therefore it can be concluded that element X is Nitrogen.

The atomic number of Nitrogen =7

  • The electronic configuration of Nitrogen is 2,5.
  • So the number of electrons in the valence shell is 5.

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