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Jan 1, 1000
Democritus
460 B.C.
– developed idea of atoms
–"if you bread matted in half, and then break it in half again, how many breaks will you have to make befor you can break it no more?" -
Jan 1, 1000
Aristotle
- thought the idea of atoms was worthless. influenced many people to think it was worthless because he had a great influence on societly.
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Dicovery of America
Christopher Columbas accidently discovered it while trying to reach India by proving the earth round. -
Steam Engine
invented by Thomas Newcomen -
Antoine Lavorsier
- first to make an extensive list of the elements.
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First Train
invented by William Jessup -
First Steam Boat
invented by John Fitch -
Joseph Proust
- invented the law of definate proportions and wrote a paper on it. the law was not accepted until 1811.
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John Dalton
-used chemicals to show that matter seemed to consist of elementry lumpy particals. knew the evidence pointed to something fundemental. -
Amadeu Avagadro
- hypothisiszed now's avagado's law. V/n=k
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Assisnaton of Abraham Lincoln
shot by john wilks booth -
William Crookes
-developed vaccume tube that allowed him to produce cathodode ray tubes with a smaller residual gas pressure. -cathodode rays were negitivly charged by studing deflection of cathode rays by magnetic fields. -
first car
invented by Charles Edgar Duryea and his brother Frank -
Henri Bequenel
- Discovered radio activity
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J.J. Thompson
-discovered electron and proosed the "rasin in pudding" atom model. -
Max Planck
- discovered light eliminated heart from an object and invented the quantu therory.
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Madame Curie
- shared in the diescovery of radio activity.
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first airplane
by the Wright brothers. -
Albert Einstein
- emergy+mass * speed of light (squared) e=mc(squared)
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Robert Millikan
- with the oil drop expiriment found the unit charge of electron allowin gthe calculation of the mass of the electron and positively charged atoms.
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Ernest Rutherford
- bombarded atoms with alpha rays. found that the positive matter must exist in the middle. then set up a new model more like the solar system.
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Henery Mosley
- discovered each atom's neuculas had a unique electric charge.
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Niels Bohr
- made an approximation on the planetary model of the atom.
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Louis de Broglie
- believed Bohr's model was incorrect and proved it so by using waves.
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Erwin Schrodinger
- made mechanical model or quantum mechenical model of the atom used today.
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Mickey Mouse
walt disney's "mickey mouse" took off. -
Werner Heisenberg
- stated with the uncertainty principal that it's impossible to know precicely both the velosity and the precision of a partical at the same time.
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discovery of AIDS
us center of disease control discovered it in 5 homosexual men in LA. -
Twin Towers
World Trdae centers attacked and collapsed
