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Nitrogen exists as diatomic molecule and...

Nitrogen exists as diatomic molecule and phosphorus as `P_(4)`. Why ?

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Nitrogen becaues of its small size and high electronegativity forms `ppi-ppi` multiple bonds. Therefore, it exists as a diatomic molecule having a triple bond between the two N-atoms. Phosphours, on the other hand, due to its larger size and lower electronegativity usually does not form `ppi-ppi` multiple bonds with itself. Instead it prefers to form P-P single bonds and hence it exists as tetrahedral `P_(4)` molecules.
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