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An atom is the smallest particle of matter that retains the chemical properties of the element of which it is a part. It contains a central nucleus with electrons moving around the nucleus in shells.
Anne Evans
An atom is the smallest part of an element which can exist and still retain all the properties (both chemical and physical) of that element.
Penny Rollo, England
An atom has the same number of protons as electrons, making it electrically neutral.
Anne Evans
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