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Atoms – 2


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In 1805, the English chemist and physicist, John Dalton, stated that all matter consists of small particles which he called ‘atoms’. Dalton’s theory, which helped to explain many different observations that he and other scientists had made, has been supported  and changed by scientists since his time, but it is basic to an understanding of chemistry and biology today.

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Atoms are the smallest particles of matter that have the properties of the chemical elements – hydrogen, oxygen, iron, and so on. They are so small that it is impossible to see them even with a high-powered microscope. Everything on Earth is made up of atoms in different chemical combinations. Water, for instance, is a compound of two elements, two atoms of hydrogen and one atom of oxygen. However, some elements, such as gold and diamonds exist uncombined.

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