Question
Tue February 21, 2012 By: Devansh Tiwari

Why Phosphorous will not form PH5?

Expert Reply
Thu February 23, 2012

 PH5 can not be formed or it doesn’t exist because firstly five unpaired electrons are not available in phosphorus to share with hydrogen and secondly phosphorus can show pentavalent character with highly electronegative elements like F and Cl and hence it forms the compounds PF5 and PCl5. And also unlike F and Cl, hydrogen doesn’t have p-orbitals for the overlap.

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