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Isaac Newton
Isaac proposed that the universe was mechanical and contained solid masses in motion. -
John Dalton
In 1803, John Dalton created his atomic theory: he theorized that all matter was made of small indivisible particles, all atoms of a certain element are identical, and that atoms can be combined into compounds and other complex molecules. -
Michael Faraday
Michael Faraday discovered electromagnetism induction in atoms through his experiments. -
Dmitri Mendeleev
In 1869, Mendeleev constructed the first Periodic Table of Elements based on atomic mass. -
J.J. Thomson
He discovered the electron, the first known component of the atom. The electron is the negatively charged particle in the atom. -
Ernest Rutherford
Rutherford, using thin gold foil and a laser, established the discovery of the nucleus, a small, dense center to the atom. -
Frederick Soddy
Soddy discovered isotopes and the half-life of radioactive substances decaying. -
Albert Einstein
Einstein proposed his theory of relativity. -
R.A. Millikan
Using an oil-drop experiment, Millikan determined the mass and the charge of an electron. -
H.G.J. Mosely
Mosely, using X-Rays, determined the charges of the nuclei of atoms. He definited atom number which became the basis of the periodic table. -
Francis William Aston
Aston used a mass spectrograph to discover isotopes, elements with different masses but still are the same element. -
Niels Bohr
He created an atomic model containing a nucleus and orbital shells of electrons. -
De Broglie
He discovered that electrons had a dual nature-similar to both particles and waves. -
James Chadwick
Chadwick discovered a particle of near equal mass to the proton with no electric charge. He had found the neutron. -
Enrico Fermi
He commenced the first controlled, experimental chain reaction involving releasing energy from an atomic nucleus.
