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400
B.C. Democritus
He Concluded that all matter consisted of atoms. These atoms could not be divided any further and were all comprised of the same primary matter. -
Antoine Lavoisier
Introduced Quantative Chemistry and Internal Combustion -
Joseph Proust
He Created the Definite law of proportions -
John Dalton
Created Dalton's Atomic Theory (As Listed)- Matter is composed of small particles called atoms. 2. All atoms of an element are identical, but are different from those of any other element. 3. During chemical reactions, atoms are neither created nor destroyed, but are simply rearranged. 4. Atoms always combine in whole number multiples of each other. For example, 1:1, 1:2, 2:3 or 1:3.
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Dmitri Mendeleev
Created the first Periodic table of elements -
Max Planck
Created the Planck Constant, Planck Postulate and the Planck's law of black body radiation. -
Henri Becquerel
Henri accidently discovers Radioactivity while experimenting with Phospheresence in Uranium salts. -
Marie Curie
Made contributions to the discovery of radioactivity -
J.J. Thomson
J.J. Thomson discovers the electron -
Hans Geiger
Discovered the Atomic Nucleus. Invented the "Geiger Counter" -
Niels Bohr
Worked with the United States on the "Manhattan Project" -
Erwin Schrodinger
He came up with schrodinger's equation which helped predict energy of atoms and their electrons. -
James Chadwick
He worked on the ionization of phosphorus and also on the photo-chemical reaction of carbon monoxide and chlorine. James was also affiliated with the "Manhattan Project" -
Robert A. MIllikan
Mass of electon determined -
H.J.G. Mosely
Atominc Number determined, Reorganized the periodic table of elements. -
Earnest Rutherford
Confirmed the excistence of the Proton, Proposed the idea of the nuetron. -
James Chadwick
Nuetron identified
