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400
Democritus
Democritus was the first to have the idea of the atom and named it "Atomus". It all began with the belief that elements could be divided into little structures. -
400
Democritus Model
This model was made after Democritus and is said to be uncuttable. That is why it is a solid round cirle. -
400
Aristotle
He was a famous philosopher. He disagreed with Democritus and his theories. Although it led to more and more discoveries and theories. -
Period: 400 to
Science Through The Ages
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John Dalton
He reopened the idea of the Atom and founded the John Dalton Atomic theory. -
Amadeo Avogadro
He said that atoms can be added with "fixed proportions" and is the founder of the word "molecules". -
Michael Faraday
He studied "electrolysis" as the splitting of molecules with electricity. -
J. Plucker
He built one of the first cathode ray tubes. -
Sir William Crookes
He discovered that cathode rays can ttravel in straight lines. -
Henri Becquerel
He discovered radioactivity from leaving uranium on a plate in a drawer and discovering that it had seeped through the plate. -
Joseph Thomson
He discovered the electron and is the mind under the Thomson Model . -
Marie and Pierre Curie
Marie and Pierre both were studying radioactivity and discovered polonium and radium. In the end, they both died from radiation. -
Thomson Model
This model was based on J.J. Thomson's atomic theory. It contained small negatively charged particles. -
Albert Einstein
He was the creator of the famous equation E=MC2. -
Lord Ernest Rutherford
He was the first to discover the breakable atom. He did so by doing an experiment with gold foil. -
Niels Bohr
He is the mind under the Bohr model where electrons travel in fixed orbits. -
Francis Aston
He was the one to dicover isotopes through a mass spectograph. -
Cockcroft/Walton
They built a lithium accelerator that produced alpha particles. -
James Chadwick
He was the one to dicover the neutron through alpha particles. -
Enrico Fermi
He was the first to do a controlled chain reaction experiment that released energy from the nucleus. -
Electron Cloud of Probability
Electron particles don't really follow fixed orbits, but can go to any part of the nucleus at some particular time.
