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Physics 7 Online
OpenStudy (anonymous):

which of the follwing represents a compound. h, H2O, H-3, O-16

OpenStudy (kittiwitti1):

\[H_2O\]is a compound of hydrogen, H, and oxygen, O. There are two hydrogen molecules, which is why there is a subscript 2 next to the H.

OpenStudy (isaiah.feynman):

A compound is defined as the chemical combination of two or more elements.

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