different atoms combined in definite proportion
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Elements can be chemically combined into compounds, therefore, a compound consists of two or more elements combined, in definite proportions, by chemical means. Compounds may be formed by combining atoms of their constituent elements by ionic bonds or by covalent bonds.
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Law of Definite Proportions states that in a given type of chemical substance, the elements are always combined in the same proportions by mass. ... Oxygen makes up 88.8% of the mass of any sample of pure water, while hydrogen makes up the remaining 11.2% of the mass.
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