Two or more atoms that are chemically linked to make  substance with unique properties ? 

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Two or more atoms when chemically linked to form substance with unique properties result in the formation of a chemical compound or simply, compound. In simpler terms, two or more different atoms (chemically) combine in a fixed ratio and result in a substance known as a chemical compound or simply a compound. The participating atoms are from pure elements, each with its own set of properties. However, when a compound is formed, participating atoms lose their individual properties (that they had as an element) and the compound as a whole has a new set of characteristics. For example, hydrogen is a fuel and oxygen is necessary for starting a fire. However, when atoms of hydrogen and oxygen combine, in a 2:1 ratio, we get water (H2O), which is used for extinguishing fires. 

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