Ionic Compound: A type of compound formed through the transfer of electrons between atoms. Magnesium oxide is an example of an ionic compound.
Oxidation State:The charge on an atom resulting from the gain or loss of electrons during a chemical reaction. In magnesium oxide, the oxidation state of magnesium is +2 and for oxygen it is -2.
Quicklime: Another name for calcium oxide (CaO), which has similar properties to magnesium oxide. Both compounds are used in various applications including building materials and medicine.