Element, Element, Na - Element, Element, Co - Element, Element, a pure substance that cannot be broken down chemically. - Element, Element, O2 - Element, Element, Compound, Compound, NaCl - Compound, Compound, CO - Compound, Compound, a substance that consists of 2 or more elements combined in a set ratio. - Compound, Compound, H2O - Compound, CH4 - Compound,

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