which best describes a compound such as magnesium oxide?\no an impure substance that is made up of two…

which best describes a compound such as magnesium oxide?\no an impure substance that is made up of two elements\no a mixture of two uncommon substances\no a mixture of two common elements\no a pure substance that is made up of different elements
Answer
Brief Explanations:
Magnesium oxide ($MgO$) is a compound. Compounds are pure substances formed by chemical combination of different elements. Magnesium ($Mg$) and oxygen ($O$) combine to form magnesium oxide. It is not an impure substance or a mixture.
Answer:
a pure substance that is made up of different elements