Question

What is the valency of phosphorus in phosphoric acid​ and how to calculate it

Answer 1

Explanation:

Valency is the number of electrons that can be gained or lost to complete octet. In H3P04, H has a valency of +1 as it has electronic configuration of (1). So, after losing total of 3 electrons by each H, remaining part has a valency of -3 i.e (PO4)3-.