* Metallic salts are typically formed by the reaction of a metal with an acid. The resulting compound contains a metal cation and a non-metal anion.

* Zinc phosphide is formed by the direct reaction of zinc and phosphorus. It is a binary compound (made of two elements) and is not formed by the reaction with an acid.

Instead, zinc phosphide is considered a:

* Phosphorus compound: It contains phosphorus as a key element.

* Intermetallic compound: It involves a bond between two metallic elements (zinc and phosphorus).

So, while it contains zinc, it's not formed in a way typical of metallic salts.