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Democritus 400BC
In 400 BC he was the first to propose the theory of atoms, calling them atomos. -
Anoine Lavoisier
In 1778 discovered the Law of Conservation. -
John Dalton
Can be said as the father of the atomic theory. He came up with it in 1803 and purposed it.He thought that only like atoms in a mixture of gases repel one another, and unlike atoms appear to react indifferently to each other. He believed that different elements vary in size and mass, this was his main feature to his atomic theory.Came up with the atomic theory saying that everything is made up of atoms whether it be a gas, liquid, or a solid. -
J.J. Thomson
Created the Cathode ray and calculated charge to mass ratio of electrons. -
Marie Curie
She discovered radioactivity and the relationship radioactivity and the origin of the atoms. -
Albert Einstein
Albert Einstein established the equation E=mc^2, Brownian Motion, and Photoelectric effect. Also came up the Theory of Relativity. -
Ernest Rutherford
Conducted the gold foil experiment identifying properties of alpha and beta particles and discovering the nucleus. -
Robert Millikan
Found the charge of a single electron and confirmed Thompson’s hypothesis.
Accurately determined the charge of an electron by the means of The falling-drop method. Also that this quantity was constant for all electrons. -
Niels Bohr
Niels Bohr atomic model not only explained the structure of the Rydberg formula and its reasoning but also gave a reason for its unclear result in terms of fundamental physical constant. -
Werner Heisenbery
Came up with how to count units in an atom.He also calculated the behavior of electrons and other subatomic particles. -
Erwin Schrodinger
Calculated the likelihood of finding an electron in any given location around an atom. Described elctron orbit clouds. -
Louis De Broglie
His work allowed others to build off it to further investigate atoms. His work was the basis of the wave mechanics theory. -
James Chadwick
Discovered neutrons and their properties. -
Max Planck
His quantum theory accounted for many problems between some phenomena and classical theory.He discovered that energy emitted by a resonator could only take on discrete values or quanta. He discovered that energy emitted by a resonator could only take on discrete values or quanta. He discovered this by experimental observations on wavelengths distribution of the energy put out as temperature. Also had his Planck Constant h=6.626 x 10-34 power Ja
