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400
Democritus
He thought everything was made up of tiny things called atoms -
400
Aristotle
He thought that Democritus idea was wrong and that everythings was made up of the 4 elements -
Period: 400 to
Atom
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Isaac Newton
Proposed a mechanical universe with small solid masses in motion. -
Antione Lavoisier
He stated that elements are simple substances that can't be broken down -
Joseph Proust
He stated that the composition of a substance will always be the same -
John Dalton
Proposed theory of multiple proportions -
JJ Thomson
He discovered the electron and the plum pudding model -
Max Planck
stated quantum theory -
Albert Einstein
Stated the theory of relativity -
Ernest Rutherford
Discovered the orbital theory of the atom -
Niels Bohr
Quantum Theory of Matter -
James Chadwick
Discovered the Neutron
