-
440
Democritus
Atoms are uncuttable -
440
Democritus
Atoms are small, hard particles -
440
Democritus
atoms constantly move -
440
Democritus
conducted experiments in combining elements -
440
Democritus
atoms of the same element are exactly alike -
Dalton
All substances are made of atoms -
Dalton
elements combine in specific proportions -
Rutherford
conducted the gold foil experiment -
Rutherford
electrons move in empty space in the atom -
Rutherford
atoms contain mostly empty space -
Rutherford
there is a small, dense, positively charged nucleus -
Bohr
Electrons travel in different paths -
Bohr
electrons jump between levels from path to path -
Thompson
he conducted thecathode-ray tube experiment -
Thompson
there are small, negatively charged particles in an atom -
Thomson
his theory of atomic structure became the "plum pudding" model -
Thomson
There are small, negatively charged particles in an atom -
S+H
electons are found in electron clouds, not paths -
S+H
electron paths cannot be predicted -
S+H
atoms of different elements are different -
S+H
most of an atom's mass is in the nucleus