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400
democritus
Democritus was a student of Socrates, as well as how he theorized that everytjingis made up of invisible atoms. -
John dalton
He discovered that atoms cannot be broken down. -
John dalton
From his observations he made postulates. -
JJ Thompson
He did a sucessful tube experiment, called the cathode ray tube. -
Earnest Rutherford
The gold foil experiment. -
JJ Thompson
He made an electron model, called the plum pudding model. -
Earnest Rutherford
Made the break through saying that all atoms are mostly made up of nothing. -
Neils Bohr
Created the Bohr model. -
Neils Bohr
Organized electrons into energy levels. -
quantum theory
neutrons which were discovered by James Chadwick -
Quantum theory
made of by many of scientist -
quantum theory
Isotopes -
modern idea
uncertainty theory
