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03-Dec-2017 13:44

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Water clearly is not an element because it consists of, and actually can be decomposed chemically into, the two substances hydrogen and oxygen; these two substances, however, are elements because they cannot be decomposed into simpler substances by any known chemical process.

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In the latter part of the Middle Ages, as alchemists became more sophisticated in their knowledge of chemical processes, the Greek concepts of the composition of matter became less satisfactory.

When two or more elements combine to form a compound, they lose their separate identities, and the product has characteristics quite different from those of the constituent elements.