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If you have pure magnesium, then the two atoms that compose the substance are going to be magnesium atoms. Magnesium is an element, a pure substance composed of all the atoms of the same kind. It is not to be confused with a compound which is made up of two or more atoms of different elements.

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14y ago
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13y ago

Magnesium is an element (atom number 12) so there are only (= one kind) Mg atoms in it and no others like in molecular compounds (= of multi elements).

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Q: What are the two elements of magnesium?
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