the smallest STABLE unit of matter IS an atom
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The smallest stable units of matter are atoms. Atoms are made up of protons, neutrons, and electrons.
The basic unit of all matter is an 'atom'. Each atom consists of a small core called nucleus which accounts to most of its mass consisting of positively charged protons and neutral neutrons
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A completley filled out electron level makes the atom stable
Stable.
An atom is the smallest particle of matter that still retains the characteristics of the original matter. Within an atom, protons, neutrons, and electrons make up the basic building blocks of elements.
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