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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