-
460b.c 370 b.c
atoms indestructible, thought there was an 'atom'
thought atoms were just balls -
600B.C
Everything came from water
no atomic, no experiences -
thought all atoms moved around
no atomic modek
no experiment -
Element made extremely small particles
Atoms given element, identical in size,mass. Atoms different elements
Atom different elements combine in whole number ratios, form chemical compound -
discovred radioactivity
atom was a solid ball -
1897-discoverd electon 2,000 lighter than hydrogen atom
experiment cathade rays tube
plum pudding -
Discoverd nusleuc in atoms
atoms contained nucelus, protons, surrounded by electrons -
1908-1917
oil drop experiment
discoverd charge and mass each element -
Bohr Model created electrons in atom, orbits energy around nueleus.
Bohr Theory not all correct -
Found isotope using a mass spectrometer
formulated whole nuber rule -
Discoverd evidence toward existance of heutrons
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384b.c -322 b.c
not believe atomic theory