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