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Identify ions present in ionic compounds

Problem

Magnesium oxide is used as an antacid to treat indigestion, or as a laxative to relieve occasional constipation.
A sample of magnesium oxide in a petri dish.
A sample of magnesium oxide. Image credit: wikimedia.
Identify the ions present in magnesium oxide.
Note: The atomic numbers of Mg is 12 and O is 8.
Choose 1 answer: