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5 votes
Two or more different atoms are combined in definite proportions in any.

A. symbol C. Proton
B. Isotope D. compound

User Beep Beep
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1 Answer

2 votes
That would be compound!
Compounds are pure substances, which consists of two or more elements chemically combined in a fixed proportion by mass. Compounds have definite proportion.
User Pedro Borges
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