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400 BC
Democritus proposed the atomic theory.1803
John Dalton said that all things are made up of matter.
He also said that atoms are invisible and indestructible.1906
Marie Curie had her breakthrough on radioactivity.1911
Ernest Rutherford said that atoms have a small charged nucleus surrounded by largely empty space and are circled by tiny electrons1910
Robert Millikan discovered the quantity and determination of the charge carried in an electron1926
Erwin Schrödinger made the quantum mechanical model of the atom1932
James Chadwick discovered the nutron.1942
Albert Enstien helped to create the atomic bomb, which ended World War 2 in the Pacific.1925
Werner Heisenberg developed the “matrix mechanics” formulation now-now for quantum mechanics1913
Niels Bohr had his breakthrough on the atomic model1897
J.J. Thomson had his breakthrough on the discovery of the electron1783
Antoine Lavoisier concluded that water is not an element1909
Robert Millikan did his oil drop experiment that allowed for the calculation of the mass of the electron and the positively charged atoms1924
Louis De Broglie discovered the wave nature of electrons and suggested that all matter have wave properties.1918
Max Planck had his discovery of energy quanta.
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