define atom and what is their radius
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define atom and what is their radius
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An atom has a central nucleus . This is surrounded by electrons arranged in shells. The nucleus is tiny compared to the atom as a whole: the radius of an atom is about 0.1 nm (1 × 10 -10 m).
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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