Potassium is K (with a 1+ valence) and the phosphate anion is PO4 (with a 3- valence). Thus, it takes 3 K's for each PO4. The formula for potassium phosphate is K3PO4.
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There are several compounds that could apply to.
The simplest is potassium phosphide, K3P
This is the binary compound of potassium and phosphorus
The compound K3P is called potassium phosphide. It is formed by combining one potassium ion with one phosphide ion. It is an ionic compound with a 3:1 ratio of potassium to phosphide ions.
The chemical formula for chromium phosphide is CrP.
The formula for gold phosphide is Au3P.
The compound formula for silver phosphide is Ag3P.
The chemical formula for zirconium phosphide is Zr3P2.