-
500 BCE
The alchemists
Alchemists developed a theory that all metals are composed of mercury and sulfer and that it is possible to change base metals into gold -
460 BCE
Democritus
He was an ancient greek pre-socratic philosopher famous for his atomic theory of the universe -
384 BCE
aristotle
Greek philospher who invented a theory thats is supposedly incorrect in present time. The theory seemed to be supported in everyday life -
427
plato
Plato introduced the atomic therory in which ideal geometric forms serve as atoms -
Robert Boyle
Anglo-Irish natural philosopher, chemist, physicist, and inventor. -
Lavoisier
Lavoisier proposed theoxygen combustion theory, which was based on sound mass measurements. -
Solid Sphere of "Billiard Ball" model
The Billiard Ball model because Dalton thought atoms were the smallest particles of matter, he envisioned them as solid, hard spheres, like billiard (pool) balls, so he used wooden balls to model them. -
John Dalton
Eglish chemist, physicist, and meteorologist. He was best known for proposing the modern atomic theory. -
dmitri mendeleev
He created the periodic table of elements -
J.J.Thomson
Thomson created the discovery of the electron -
The curies
Pierre and Marie Curie were to discover and isolate radium -
Ernest Rutherford
British physicist who was best kown to be the father of nuclear physics -
plum pudding model
Created by J.J. Thomson. Early 20th century model of an atom, later disproved. -
Albert Einstein
German born theoretical scientist and physicist. Developed the theory of relativity -
neils bohr
A Danish physicst who made foundational contributions to understanding atomic structure and quantum theory. -
Henry G.J. Moseley
English physicist who created moseley's law -
solar system model
Created by Bohr. Solar system model states that atoms consist of a nucleus with a number of electrons in orbits around the nucleus -
Robert Millikan
succeeded in finding the size of an electron -
Werner Heisenberg
contributed to atomic theory through formulating quantum mechanics in terms of matrices and in discovering the incertainty principle -
Electron Cloud model
Created by werner Heisenberg. A way to help visualize the most probable position of electrons in an atom.
