What is a Atom???????
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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. ... The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons.
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atom is the smallest part of the matter
the smallest particle of a chemical element that can exist.
the group of the same kind of atoms is known as element
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