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atom definitions

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proton   a positive particle in the nucleus of the atom  
neutron   a neutral particle in the nucleus of the atom  
electron   a negative particle which moves in shells around the nucleus  
atomic number   the number of protons in an atom  
mass number   the sum of protons and neutrons in an atom  
isotopes   atoms of the same element with the same number of protons and electrons but different numbers of neutrons  


   

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