The names of the compound formed would be magnesium sulfate, potassium chloride, sodium iodide, and barium oxide respectively.
Empirical formula and names of compounds
The combinations of the ions, their empirical formulas, and their names would be as follows:
[tex]Mg^{2+}[/tex] + [tex]S^{2-}[/tex] [tex]MgS[/tex] Magnesium sulfate
[tex]K^+[/tex] + [tex]Cl^-[/tex] [tex]KCl[/tex] Potassium chloride
[tex]Na^+[/tex] + [tex]I^-[/tex] [tex]NaI[/tex] Sodium iodide
[tex]Ba^{2+}[/tex] + [tex]O^{2-}[/tex] [tex]BaO[/tex] Barium oxide
More on empirical formulas can be found here: https://brainly.com/question/12649384
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