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Jan 1, 1000
Democritus
First person to propose that matter was not infinitely divisible. Lived from 460-370 b.c. -
Jan 1, 1000
Artistotle
Said atoms move through empty space. Lived from 384-322 b.c. -
Antonie Lavosier
Discovered oxygen. -
Joseph Proust
Formulated the law of definite proportions. -
John Dalton
Developed Dalton's Atomic Theory -
Amadeo Avagadro
Hypothesized that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules -
J.J Thomson
Determined charge to mass ratio. Concluded that mass of a charged particle was much less than that of a hydrogen atom. In the late 1890's. -
William Crooks
Discovered cathode ray that led to the invention of the television. -
Henri Becquerel
Discovered of natural radioactivity -
Henry Moseley
Atoms of each element contain a unique positive charge in their nuclei -
Max Planck
Discovered the quantum theory. -
Cuba
Cuba gained independence from Spain -
Robert Millikan
Calculated mass of a single electron. -
Madame Curie
Discovered radioactivity, polonium and radium. -
Niels Bohr
Discovered that atoms contain of a nucleus at the center and is surrounded with electron shells. -
Albert Einstein
Developed theory of general relativity. Formula led to atomic bombs and nuclear power. -
Ernest Rutherford
Concluded a nucleus contained positively charged particles called protons. -
Louis deBroglie
Discovered that electrons could behave as waves -
Werner Heisenberg
Created quantum mechanics. -
China
Chiang Kai-shek becomes leader of China's revolutionary party following the 1925 death of Sun Yat-sen. -
James Chadwick
Showed that nucleus contained neutrons. -
Battle of the Bulge
Battle of the Bulge begins as Germans penetrate Allied front in Belgium (Dec. 16 to Jan. 1945). -
Erwin Schrodinger
Developed Schrodinger's equation which helped predict and calculate the energy of atoms as electrons move around. -
Israel
US recognizes the state of Israel. -
India
India suffers the worst famine in 20 years; Lyndon Johnson asks for $1 billion in aid to the country. -
President
Richard M. Nixon is inaugurated 37th President of the US (Jan. 20). -
Skylab
Skylab, the first American space station, is launched (May 14). -
Women
US Supreme Court rules Rotary Clubs must admit women. -
Gene Transfer
Human gene transfer developed by Steven Rosenberg, R. Michael Blaese, and W. French Anderson -
Texting
Oct. 1: President Obama signs an executive order banning federal workers from texting while driving.