Why nitrogen is a stable molecule?
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Answer:
The dinitrogen molecule (N2) is an "unusually stable" compound, particularly because nitrogen forms a triple bond with itself. ... The compound is also very inert, since it has a triple bond. Triple bonds are very hard to break, so they keep their full valence shell instead of reacting with other compounds or atoms.
Chemical bonds are important factors for a chemical substance which decides the stability of that substance.
The stability of the chemical substances according to the chemical bonds present in that substance's molecule :
Triple bond > Double bond > Single bond.
Which means triple bond containing substances are very stable because the energy needed to break the triple bond is way more higher than the double bond or single bond.
And the nitrogen (N2) forms triple bond in itself.
That's why the nitrogen is a very stable molecule.