the atom, the smallest part of an element, electron, is a negatively charged, proton, is positively charged, neutron, has no charge it is neutral, nucleus, found in the center of an atom, shell, path taken by the electron as it moves around the nucleus, atomic number, tells the number of the protons in an atom, atomic mass number, is the total number of protons and neutrons in and atom, isotopes, atoms with the same atomic number but have a different atomic mass number, stable atoms, the number of postive protons and number of negiative charge electrons are the same, the lightest subatomic particle, is the electron, element, made up of one type of atom only

The atom

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