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490 BCE
Democritus
Defined "atomos" as the smallest piece of unbreakable matter. -
Period: 490 BCE to
atoms across history
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343 BCE
Aristotle
Aristotle came up with the initial idea of matter. -
1 CE
Alchemist
Alchemist are people who study alchemy. alchemy - the medieval forerunner of chemistry, based on the supposed transformation of matter. -
Charles De Coulomb
Charles developed the coulombs law and deffinition of eletrstatic force in france 1779. Fun fact he was in the military. -
Lavoisier ,France
He named oxygen and hydrogen, helped construct magnetic system, wrote list of elements, established sulfur. -
John Dalton ,England
John developed the atomic theory, researched color blindness. Fun fact he was born into a quaker family. -
Marie Curie
Marie pioneerded reasearch of radioactivityin poland. Fun fact she descovered polonium and radium. -
Crookes ,England
The crookes invented the crooks tube , radiometer, meteorologist, discovered thallium, and identified helium. -
J.J. Thomson
In Cambridge University he is credited with the discovery and identification of a electron. He is also credited with finding evidence for isotopes existance. Fun fact he won a nobel peace prize. -
Eugen Goldstein, Berlin,Germany
A german physicist who investigated discharge tubes and anode rays. He also discovered protons and electrons. Fun fact: He was the head of the astrophysical section at Potsdam Observatory -
Becquerel ,France
He discovered radioactivity which early contribution to atomic theory. Fun fact became chief engineer in department of bridges and highways. -
Robert Millikan
Robert Millikan discoverd the eletric chage of an electron at the University of Chicago in 1909. Fun fact he wrote a short passage for the Westing house time capsule. -
Geiger , Germany
Geiger created the griever counter , detected alpha particles. Fun fact he attempted to develop a atomic bomb. -
Rutherford's Nuclear Atom
Found by Ernest Ruterford.The model described the atom as a tiny, dense, positively charged core called a nucleus, in which nearly all the mass is concentrated, around which the light, negative constituents, called electrons, circulate at some distance, much like planets revolving around the Sun. -
Solar System Model
Niels Bohr proposed the "Solar System" model of the atom, also known as the Rutherford-Bohr model. The model is similar to a solar system: electrons revolve around the nucleus like planets revolving around the sun. However, instead of gravity being the force of attraction, electrostatic forces keep the electrons in orbit. -
Ernest Rutherford
Ernest discovered and named the proton.He also created the Rutherford's modle. Fun fact his full name is 1st Baron Rutherford of Nelson. -
Neils Bohr
Neils Bohr made the Bohr's atom modle. He is also credited with the creation of the fundamental understanding of the atomic structure and quantum theory. Finally he predicted the existance of zirconium like element at the University of Copenhagen. Fun fact he helped refuges escape from Nazism. -
W.K. Roentgen, Netherlands
He was a german engineer and physicist who produced electromagnetic radiation and X-rays. Fun fact: He published three papers on X-rays -
Electron Cloud Model
Found by Erwin Shrodinger. Electrons were no longer depicted as particles moving around a central nucleus in a fixed point -
Chadwick , Europe
Chadwick discovered neutrons, '' father of nuclear physics'' -
Max Planck ,Germany
Max was the originator of quantum theory, contributed to thermodynamics. Max was the first prominent physicist to champion Einstein's theory of relativity. -
Lise Meitener
Lise meinter discovered nuclear fission in Berlin Germany. -
Albert Einstein, Germany- New Jersey
A german born theoretical physicist who developed the the theory of relativity. He influenced on the philosophy of science. Fun fact: He is known for E=MC2 -
Erwin Schrodinger ,Austria
Erin developed a number of fundamental results of quantum theory, developed the formalism and the matrix mechanics. Fun fact he turned down a position at Princeton. -
Otto Hahn, London & Montreal
Otto was a german chemist who worked in the fields of radioactivity and radiochemistry. He was known as the " Father of Nuclear Chemistry" Fun fact: He was the last president of the Kaiser Wilhelm Society -
George Zwieg
George introduced the quark in the United States. Fun fact he was born in Russia. -
Glenn T Seaborg, U.S.A
He was an American chemist who discovered ten transuranium elements. Glenn arranged the actinide series in the periodic table. Fun fact: He advised ten presidents, form Truman to Clinton
