History of Chemistry

Wilnelm Roentgen

1895: X-rays

Robert Boyle

1661: measurement of chemistry; log book "analytical chemistry"

John Dalton

1808: 4 postulates on automic behavior.
1.) elements-> atoms
2.)all atoms of a given type are identical
3.) compounds
4,)chemical reactions- reorganization of matter

Robert Millica

1909: charge on the electron

H Becquerel

1896: luminescence "fire fly"

Rutherford

1899: resolved radiation

1904 JJ Thomson

plum pudding atom.. blue=positive charge electrons are scattered randomly

1907 EB Rutherford

found the nucleus- Hans geiger

James Chadwick

1932: neutron verified

Demicritus

460 BC: "atomos"-> invisible

Lauoisier

1789: matter is conserved. You cannot create or destroy matter

avagadro

1811: molar volume: 22.1 L per mole element

Joseph Gay-Lussac

1811: discovered diatomics

William Crookes

1875: Cathode Ray Tube

JJ Thomson

1897: discovered electrons