Question

why nitrogen is gas where as phosphours is solid out at room tempretaure?

Answer 1

Answer:

Due to larger atomic size it does not form pi bonds with itself. Hence, in P4 molecule P forms sigma bond with other phosphorous atoms. ... So, since the force of attraction between Phosphorous molecules is high and that between Nitrogen molecules is low, Phosphorous is a solid while Nitrogen is a gas.

Answer 2

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★ The size of nitrogen is quite small. As a result two nitrogen atoms can be linked to each other by three covalent bonds in order to complete the octets of both the nitrogen atoms. This diatomic molecule N2 is very stable and has very negligible attraction towards other diatomic nitrogen molecules. Thus there is weak interaction between nitrogen molecules. So nitrogen exist as gas.

While phosphorus being large in size has less tendency to form three bonds. Therefore, P atoms completes octets by sharing its valence electrons with three other P atoms. As a result, it exist as tetratomic P4 molecule. In white phosphorous there is network which holds the phosphorous atoms together. This catenation tendency of phosphorus is reason why it exist as solid.