Chemistry
Grade-9
Easy

Question

Which of these is not a noble gas?

  1. Helium
  2. Nitrogen
  3. Argon
  4. Krypton

hintHint:

Nitrogen

The correct answer is: Nitrogen


    Nitrogen is not a noble gas as it belongs to group 15 and has 5 valence electrons while the others have full valence electrons.

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