history of the atomic theory

Democritus

400 BCE

DOB: 460 BC
DOD: 370 BC
country of origin: Greece
First to suggest that materials were made up of tinier things (465 BC)
https://the-history-of-the-atom.wikispaces.com/

Aristotle

384 BCE

DOB: 384 BC
DOD: 322 BC
country of origin: Greece
He believed that all substances were made of Fire, Water, Air, and Earth
https://the-history-of-the-atom.wikispaces.com/

Giordano Bruno

Oct 10, 1548

Believed that God was present in every atom

John Dalton

Oct 10, 1704

DOB: 09/26/1766
DOD: 7/27/1844
country of origin: England
His atomic theory said that elements consisted of tiny particles called atoms.
https://the-history-of-the-atom.wikispaces.com/

Antoine Lavoisier

Oct 10, 1765

DOB:1743
DOD:1794
country of origin: France
He began the conversation on what an atom was exactly
http://historyoftheatomictheory.weebly.com/antoine-lavoisier.html

Joseph Proust

Oct 10, 1794

DOB: 9/26/1754
DOD: 7/5/1826
country of origin:
Law of Definite Proportions. this law states that the ratio of elements in a compound is always the same
http://historyoftheatomictheory.weebly.com/joseph-proust.html

John Dalton

Oct 10, 1803

DOB: 9/6/1766
DOD: 7/27/1844
country of origin: England
Daltons Theory (6 parts)
-matter is composed of extremely small particles called atoms
-atoms are indivisible and indestructable
-atoms of a given element are identical in size, mass, and chemical properties
-atoms of specific elements are different thatn those of other elements
-in a chemical reaction, atoms separate, combine and/or rearrange
http://historyoftheatomictheory.weebly.com/john-dalton.html

Dmitri Mendeleev

Oct 10, 1869

DOB: 2/8/1834
DOD: 2/2/1907
country of origin: Russia
created the periodic table in 1869
http://www.chemistry.co.nz/mendeleev.htm

Eugen Goldstein

Oct 10, 1886

DOB: 9/5/1850
DOD: 12/25/1930
country of origin: Germany
in 1876 he showed that cathode rays could cast sharp shadows
https://www.britannica.com/biography/Eugen-Goldstein

J.J. Thompson

Oct 10, 1897

DOB: 12/18/1856
DOD: 8/30/1940
country of origin: England
He created the cathode ray
He found out that they were almost all negative, or beta particles.  He also determined the charge to mass ratio and came up with the idea that an atom was like plum pudding (hence the name of his plum pudding model)
http://historyoftheatomictheory.weebly.com/jj-thomson.html

Robert Milikan

Oct 10, 1910

DOB: 3/22/1868
DOD: 12/19/1953
country of origin: USA
He determined the charge carried by an electron, using the "falling-drop method". He also proved that this quantity was the same for all electrons (1910)
http://www.nobelprize.org/nobel_prizes/physics/laureates/1923/millikan-bio.html

world event

Oct 11, 1911

first use of aircraft as weapon in Turkish-Italian war
infoplease.com

world event

Oct 11, 1912

Balkan Wars

Frederick Soddy

Oct 10, 1913

DOB: 9/2/1877
DOD: 9/22/1956
country of origin: England
Discovered isotopes in 1913
http://www.nobelprize.org/nobel_prizes/chemistry/laureates/1921/soddy-bio.html

Ernest Rutherford

Oct 10, 1917

DOB:1911
DOD:1917
country of origin: USA
he conducted the gold foil experiment which then concluded that there was something inside an atom called the nucleus. He also found the charge of atoms.
http://historyoftheatomictheory.weebly.com/ernest-rutherford.html

world event

Oct 11, 1920

league of nations holds first meeting at Geneva Switzerland
infoplease.com

Niels Bohr

Oct 10, 1922

DOB: 10/7/1885
DOD: 11/18/1962
country of origin: Denmark
He suggested that electrons didn't spiral into the nucleus, but orbit in different levels. He made the Bohr model.
http://historyoftheatomictheory.weebly.com/niels-bohr.html

world event

Oct 11, 1924

Stalin wins power struggle and rules as soviet dictator
infoplease.com

Werner Heisenberg

Oct 10, 1927

DOB: 12/5/1901
DOD: 2/1/1976
country of origin: Germany
He discovered the Uncertainty Principle which states that electrons do not travel in neat orbits. He also calculated the behavior of electrons, and subatomic particles that make up an atom. 1958
https://the-history-of-the-atom.wikispaces.com/Werner+Heisenberg

James Chadwick

Oct 10, 1932

DOB: 10/20/1891
DOD: 7/24/1974
country of origin: England
Discovered neutrons. 1932
http://historyoftheatomictheory.weebly.com/james-chadwick.html

world event

Oct 11, 1949

holocaust
infoplease.com

world event

Oct 11, 1995

republicans take control of congress
infoplease.com

world event

Oct 11, 1999

US agrees to ease restrictions on Cuba
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world event

Oct 11, 2001

Terrorist attack on Twin Towers
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world event

Oct 11, 2016

world war begins 1914
infoplease.com