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atoms1

atom definitions

QuestionAnswer
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
Created by: machillea
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