Final answer:
The formula for the binary ionic compound magnesium oxide is MgO, which corresponds to option c).
Step-by-step explanation:
The question asks to match the name of a binary ionic compound with its correct formula. The specific compound to match is magnesium oxide, which is an ionic compound composed of magnesium ions (Mg2+) and oxide ions (O2-). Each magnesium ion can combine with an oxide ion to form the neutral compound MgO, as magnesium has a +2 charge and oxygen has a -2 charge, which cancel each other out to result in a neutral compound.
Therefore, the formula for magnesium oxide is c) MgO among the provided options.