What name is given to substances in which atoms of 2 or more elements are chemically combined?

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"No chemical process can break it down into a different substance. Compounds are substances that contain atoms of at least two elements chemically combine. For example: magnesium oxide consists of magnesium atoms and oxygen atoms chemically bonded together."

Therefore, the answer is compound.
Hope this helps you This answer is credited to BBC

The answer is b metal denting