write a short note on atom ??
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Atom is the smallest particle of any matter. It cannot be divided. It was discovered by John Dalton.
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An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.
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