-
360
Plato
-
410
democritus
emocritus hypothesized that all matter is composed of tiny indestructible units, called atoms. -
Sep 22, 1300
The Alchemists
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Robert Boyle
Helped develop definition of an element -
Lavoisier
Mass is conserved in a chemical reaction. -
John Dalton
He proposed an atomic theory with spherical solid atoms based upon measurable properties of mass. -
Dmitri Mendeleev
Dmitri Mendeleev created the periodic table -
JJ Thomson
He studied canal rays and found they were associated with the protons -
Ernest Rutherford
Probed atoms in a thin piece of gold foil -
The Curies
descovered the phenomenon of radioactivity -
Albert Einstein
Created the famous equation E=mc 2 -
Henry G. J. Mosley
He wrote The atomic number of an element is equal to the number of protons in the nucleus. -
neils bohr
he developed an explanation of atomic structure that underlies regularities of the periodic table of elements. his atomic model had atoms built up of successive orbital shells of electrons -
Erwin Schrödinger
