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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