FENTON

Democritus 465BC-350BC He was the first to propose that matter exists In the form of particles which he made the phrase Atoms.

John Dalton 1766-1844 He proposed the atomic theory based upon measureable masses In 1807 he created the law of partial pressure and gas

William Roentgen 1845-1923 He discovered that when some chemicals were placed near a cathode ray they illuminated He also discovered the highly penetrating x-ray

Henri Becquerel 1852-1908 He is known for exploration in radio activity in 1896 and the deflection of electrons in magnetic fields He also won a Nobel Prize in 1903

J.J. Thomson 1856-1940 He researched cathode rays and proved the existence of electrons He received a Nobel Prize for this in 1906

Marie Curie 1867-1934 She discovered and isolated both elements radium and polonium in 1898 She also studied radioactivity in uranium She received a Nobel Prize in 1903

Robert Millikan 1868-1953 Discovered how to determine the mass and charge of an electron in an oil drop

Ernest Rutherford 1871-1937 He experimented with radiation and found out about alpha and beta particles He discovered radioactive decay and calculated this for all radioactive elements In 1908 he received a Nobel Prize for his findings

Neils Bohr 1885-1962 He devised a quantum model of the atom in which atoms had an orbital shell of electrons

Erwin Schrödinger 1887-1961 He was a theoretical physicist and specialized in quantum mechanics He an Einstein created the Schrödinger cat through experiment He won a Nobel Prize in 1933

James Chadwick 1891-1979 He discovered the neutron in 1932 and won a Nobel Prize for it in 1935

Werner Heisenberg 1901-1976 He discovered the orbital theory of chemical bonding He also made the theory of quantum uncertainty principle in 1927 He won a Nobel Prize in 1932

Elias James Corey 1928-present In 1990 he won the Nobel Prize for his development of the theory and methodology of organic synthesis Robert H. Grubbs 1944-present He discovered how to use organic reactions to create better polymers and types of medicines with less waste Irina Beletskaya 1933-present She developed some of the first methods for carbon-carbon bond formation Electron cloud model 1913 This model shows how the electrons orbit the neucleus of neutrons and protons it was founded by Erwin Schrödinger and Niels Bohr

The Plum pudding Model 1904 Formed by J.J. Thomson displays the nucleus of an atom and how the electrons orbit the nucleus and their charge cancels that of the neutrons Too bad it was disproved in 1909

Rutherford-Bohr model 1909 This model showed how an atom was structured and how an atom has one central charge and had the electrons orbiting the nucleus like plants around the sun

Planetary model 1911 A positively charged nucleus that is orbited by electrons it was discovered by Niels Bohr