-
101
Thales of Miletus- 600BC
First philosopher
Cosmologial thesis (everything consists of water) -
101
Democritus- 400BC
first to think of the atom as the smalles piece of matter -
101
Aristotle- 400BC
theory of everything being made of the four elements: Fire, Water, Air, and Earth -
Isaac Newton
Discovery of Gravity, Laws fo Motion, Light Spectrum
thought Democritus was right -
John Dalton
Atomic Theory of Matter
t and f-matter is made up of atoms that are indivisible and indestrutible
f- all atoms of an element are identical
t- atoms of different elements are different
t- atoms of different elements combine in simple whole numbers to form compounds.
t and f- atoms cannot be created or destroyed -
Antoine Becquerel
discovered radioactivity
4 experements; uranium experement -
JJ Thomson
discovered electron
cathode ray tube
-first to say atom is not a solid ball
plum pudding modle -
Robert Millikan
helped determine the mass and charge fo electrons
-oil drop experiment -
Rutherford
discovered nucleus and proton
-gold foil experement -
Niels Bohr
discovered the way electrons rotated on paths
-atomic model -
Francis Aston
discovered isotopes
mass- spectrograph
-atomic model -
Erwin Schrodinger
created Schrodinger's model
predicts the odds of where electrons would be
-mechanical model of atom -
James Chadwick
proved neutoron's existance