Pentahalides of phosphorus are known, but not pentahydride. Why? – InterviewSolution

1.	Pentahalides of phosphorus are known, but not pentahydride. Why?
Answer» SOLUTION :Phosphorous exhibits PENTAVALENCY in excited state. Fluorine, CHLORINE or bromine is more ELECTRONEGATIVE and influences excitation to form `PX_(5)`. However, hydrogen is not that much electronegative to INFLUENCE the excitation in phosphorus. Hence `PH_(5)` is not formed.

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