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Answer -
Nitrogen is chemically lessreactive. This is because of the high stability of its molecule, N2.In N2, the two nitrogen atoms form a triple bond. This triple bondhas very high bond strength, which is very difficult to break. It is because ofnitrogen’s small size that it is able to form pπ−pπ bonds with itself.This property is not exhibited by atoms such as phosphorus. Thus, phosphorus ismore reactive than nitrogen.