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Dalton's Atomic Theory

an explination of the structure of matter in terms of different combinations of very small particles


one or two letter notation


positivly charged, central core of atom


negativly charged partical

J.J. Thompson

1897, discovered electron

Robert Millikan

1909, oil drop experiment

Ernest Rutherford

1911, discovered nucleus and gold foil experiment

James Chadwick

discovered neutrons

Mass Number

protons + neutrons in nucleus


an atom based on atomic number & mass number


positivly charged


substance with same atomic number


same atomic number, different mass number


elements in horizontal row


elements in columns


1869, periodic table

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