composed of two or more elements not chemically combined
a pure substance that contains two or more kinds of atoms
cannot be separated into simpler materials by chemical reaction
properties are often similar to the properties of its components
are mostly metals
can be prepared in many possible concentrations
composed of atoms chemically combined
can be separated into their components only by a chemical reaction
components are present in definite proportions
their properties are usually quite different from the properties of their components
can be separated into their components by physical methods
a pure substance containing to or more kinds of atoms
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