Question

What is the correct name for `AlS_3`?

Answer 1

Aluminum sulfide (`Al_2S_3`)

Explanation:

As far as I know, `AlS_3` is not a real compound, so I'll use `Al_2S_3` which may be what your question is asking for..

Since this is a binary ionic compound, the name consists of the cation (`Al`) followed by the anion (`S`) with a suffixe of -ide, so the name of `Al_2S_3` is aluminum sulfide.