Question

What is the valency of phosphorus in phosphorus pentoxide?

Answer 1

Valency of an element in a compound is the combining capacity of that element.

Here, phosphorus is in combined sate with oxygen.Formula of phosphorus pentoxide is P2O5.  

SO,    

2X + (-5x2)=0        

X= 5.

Therefore valency of phosphorus in P2O5 is 5.

Four valency and one coordinate type bonding formation is there.

Answer 2

the valency of phosphorus in p2o5 is 5