Atoms, Molecules, and Ions

16 terms by YeriBridgett

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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

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