Question

what is phosphide s formula and wat is its valence

Answer 1

The phosphide ion is an ion formed when a phosphorus atom accepts 3 electrons, and is denoted by P^3-. Its valency is 3. The term phosphides is also used for the compounds containing the phosphide ion.

Another important point to note is that valency of an element or an ion does not possess any charge. It is the charge on an ion which is either positive or negative. Valency is simply defined as the combining power or the combining capacity of an atom. So, the valency of phosphide ion is 3.