What is the correct name for P4S3?

The correct name for P₄S₃ is tetraphosphorous trisulfide or also known as phosphorous sesquisulfide.

Explanation:

P represents the element phosphorous.

S represents the element sulfur.

Since there is a 4 beside P, then we are going to use the prefix "tetra-". Since there is a 3 beside S, then we are going to use the prefix "tri-". We will also use the suffix "-ide" in sulfur because we are naming a compound with multiple elements.

So, P₄S₃ will be named tetraphosphorous trisulfide. When using more scientific terms, then the name of the compound is phosphorous sesquisulfide.