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