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Democritus
Democritus is best known for his atomic theory of the idea that everythin could be broken down into smaller pieces. (400 B.C.) -
Isaac Newton
(1679-1680)
Isaac invented the infintesimal calculas and a new theory of light and color, Newton transformed the strucure of physical science witg his three laws of motion and the law of univeral gravitation. -
John Dalton
Dalton proposed the atomic theory of matter based on his experimental observations.
His theory consisted of:
-All matter is made of atoms(invisble and indestructable)
-All atoms of a given element are identical in mass and properties.
-Compounds are formed by a combination of two or more different kinds of atoms.
-Chemical reaction is a rearangment of atoms.
-Atoms can't be created nor destroyed
(1766-1844) -
Marie Curie
Marie started to investigate uranium rays and began experiments at once. She discovered that the strength of the rays that came out depended only on the amount of uranium in the compund. Pushing through more compound, the mineral pitchblende, rich in uranium, gave off more radioactivity that could be accounted for by the uranium in it. After long labor they succeeded and revealed their first discovery of the elemnt "polonium" which they named "Radium" from the latin word ray. -
J.J. Thomason
Thomason led to the discovery of the fundamental building block of matter.
(Electron)
He investigated the puzzle known as "cathrode rays". He was venturing in the interior of the atom by experimenting with currets of electicity inside empty glass tubes.
Leading to the discovery of the electron. -
Ernest Rutherford
100 years ago Rutherford presented a paper to the Manchester Literary and philosophical society. He was responsible for a series of discoveries in teh fields of radioactivity and nuclear physics.
Discoveries:
*Alpha and Beta Rays
*Set the laws of radioactive decay
*Identified alpha particles as hulium nuclei
**Most Important was he postulated the nuclear structure of the atom. -
H.G. Moseley
Moseley's Law: observed and measured the x-ray spectra of various hemical elements obtained by diffraction in crystals. He discoveried a systematic relation between wavelength and atomic numbers. -
Niels Bohr
He was one of the foremost scientists of modern physics, best known for his substantial contributions to quantum theory and his Nobel-Prize winning research or the structure of atoms. He won the Nobel Prize in 1922 for the nuclear and Plauck's theroy about Quanta. -
Hans Geiger
His fatehr was a professor at the university of Erlangen.
He invented radioactivity measuring device know as the Geiger counter.
In 1928, at the Universirty of Keil, Geiger worked to improve teh Geiger counter. -
Glenn Seaborg
He was an American Nuclear Chemist that was bet known for his work on isolating and identifying transuranium elements. He won the Nobel Prize in 1951 for Chemisrty with Edwin McMillian for the discoveries of transuranium elements. -
Werner Heisenburg
Created the Matrix Mechanics
Calculated the behavior of Eletron, and subatomic particles that also make up an atom.
