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Give reason why elemental nitrogen exits...

Give reason why elemental nitrogen exitsts as diatomic molecule whereas elemental phosphours is a tetraatomic molecule.

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Nitrogen is diatomic `(N_2)` because of its ability to form `ppr-ppr` multiple bond. This is not possible in other elements of group 15 elements due to greater repulsion between non-bonded electrons of the inner core electrons.
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Assertion : Elemental nitrogen exist as a diatomic molecule and phospours as tetratomic molecule. Reason :Nitrogen does not have vacant d-orbital wheras phosphorus have vacant d-orbital.