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101
Thales- 620 BC
The first person to think of the atom. -
101
Democritus- 440 BC
The first one to come up with the name "atom" -
101
Aristotle- 340 BC
Believed in the four elements fire, air, water, and earth instead of the atom. -
Isaac Newton
He contibuted to the atomic theory (atoms are held together by attractions or forces) -
Dalton
He came up with Dalton's atomic theory. -
Henri Becquerel
He figured out that elements could be radioactive. -
J.J. Thomson
He discovered electrons and came up with plum pudding atomic model. -
Milikan
He did the Oil Drip experiment and found charges of individual electrons. -
Rutherford
He did the Gold Foil experiment and was credited for the discovery of the proton. -
Bohr
He contributed to theory on electrons and a primitive hydrogen model. -
Francis Aston
He invented the Mass Spectrograph and discovered isotopes. -
Schrodinger
He used math equations to find the probability an electron would be in a certain position. (Quantum Mechanical Model of the Atom) -
Chadwick
He discovered the neutron.