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10 Cards in this Set

  • Front
  • Back
mass can neither be created nor destroyed
law of conservation of mass
negatively charged particle
electron
discovered the electron
Thomson
positively charged particles
protons
particles with no charge
neutrons
bombarded a sheet of gold foil with positive particles
Rutherford
short-range forces that hold protons together, neutrons together, and protons to neutrons
nuclear forces
atoms of the same element that have different masses
isotopes
the number if protons in an atom
atomic number
the number of protons and neutrons
mass number