# What is the net charge of the ionic compound, rubidium sulfide?

What do I mean? Rubidium sulfide is made of two ions, $R {b}^{+}$ and ${S}^{2 -}$. But while the individual ions may be charged, oppositely charged ions will be drafted so as the charge is neutral. The sulfide ion, ${S}^{2 -}$, thus requires $2 \times R {b}^{+}$ for electrical neutrality.