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465 BCE
Democritus
Democritus's contribution was that he hypothesized that the atom could not be destroyed or altered in any way and that there are an infinite number of atoms. -
Antoine Lavoisier
His contribution to the Atomic Theory was that he came up with the Law of Conservation. The Law of Conservation simply states that matter cannot be made or destroyed. -
John Dalton
His contribution to the atomic theory was his theory that the elements were different from each other as a factor of the mass of their atoms(atomic mass) -
J.J. Thomson
J.J. Thomson contribution was that he discovered the subatomic particle known as the electron. -
Marie Curie
Marie's Contributions to the research of radiation significantly helped the atomic theory -
Albert Einstein
He is known as the father of modern physics for his discoveries. He came up with a mathematical formula to predict the size of molecules and atoms. And he contributed much more after that. -
Ernest Rutherford
He created the Rutherford Model: Atoms contain a small charged nucleus surrounded by empty space and are circled by tiny electrons. -
Niels Bohr
He discovered the electron which was of course a major contribution to the atomic theory. -
Max Planck
Best known for creating the quantum theory of energy -
Robert Millikan
He helped express the measurement of the charge of an electron. -
Erwin Schrodinger
He modified the bohr atom model. He used mathematical equations to explain the possibilities of finding an electron in a certain position(The Quantum Mechanical Model of the Atom). -
Werner Heisenberg
He is known for the creation of quantum mechanics -
Louis De Brogile
He is best known for his contribution to the quantum theory. -
James Chadwick
He discovered the neutron. The combination of beryllium atoms and alpha particles resulted in a new radiation which was made up of particles with a neutral electric charge.
