Answer
(a) Li$_{2}$O
Li$^{+}$ and O$^{2-}$
Lithium Oxide
(b) CaS
Ca$^{2+}$ and S$^{2-}$
Calcium Sulfide
(c) Mg$_{3}$N$_{2}$
Mg$^{2+}$ and N$^{3-}$
Magnesium Nitride
(d) Al$_{2}$S$_{3}$
Al$^{3+}$ and S$^{2-}$
Aluminum Sulfide
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