A _______________ (compound/mixture) is formed when two or more elements combine together chemically.

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Solution

If two or more elements are chemically combined together in a fixed proportion by mass, it constitutes a compound. For example, NaCl is a compound.
A mixture is composed of two or more substances combined together in any proportions. A mixture retains the property of individual substances. For example air.
Hence, a compound is formed when two or more elements combine together chemically.

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