Question

What does the following formula stand for?

${\mathrm{Ag}}_2\mathrm{S}$

Answer 1

This formula contains an Argentous[Silver(I)] ion $\left[{\mathrm{Ag}}^{+}\right]$ and sulfide ion $\left[{\mathrm{S}}^{-2}\right]$.

The chemical formula for ${\mathrm{Ag}}_2\mathrm{S}$ is Argentous Sulfide or [Silver(I)] sulfide.

Where (I) indicates valency of silver ion