Answer:
MgO
Step-by-step explanation:
Mg, which is magnesium, is considered a metal, when paired with Oxygen, which is a gas, it creates magnesium oxide, and the formula itself is a pairing of a metal with a nonmetal
Metals are red, nonmetals are blue, and metalloids are yellow in the attached file.
Using this table, you can see that Mg is a metal and O is a nonmetal, which fits the question criteria.
Hope this helps!
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