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16 terms

Atoms, Molecules, and Ions

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Dalton's Atomic Theory
an explination of the structure of matter in terms of different combinations of very small particles
symbol
one or two letter notation
nucleus
positivly charged, central core of atom
electron
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
nuclide
an atom based on atomic number & mass number
proton
positivly charged
element
substance with same atomic number
isotopes
same atomic number, different mass number
period
elements in horizontal row
group
elements in columns
Mendeleev
1869, periodic table