History of the atom timeline by ayana and alarrya

Aristotle BC 332

200

Aristotle said in his book that all things are made up of form and matter which can only be changed with grow, crumble, or motion.

440 BCE- Democritus Discovery

440

Democritus was an Ancient Greek philosopher born in Abdera, Thrace, Greece. Democritus atomic theory stated that atoms only had several properties, particularly size, shape, and weight. http://www.chacha.com/question/what-did-democritus-say-about-the-atom#sthash.EZDHFIvt.dpuf

Dalton

Jan 1, 1803

Dalton's theory was about the atoms of different elements and different weights . http://www.rsc.org/chemsoc/timeline/pages/1803.html

Thomson

Jan 1, 1897

Thomson dicovered eletrons and he discovered sub atomic particle. http://www.rsc.org/chemsoc/timeline/pages/1897.html

Bohr

Jan 1, 1903

Bohr discoverd that the atom is small and has positive charged nucleus around neutrons. http://www.livescience.com/32016-niels-bohr-atomic-theory.html

Rutherford

Jan 1, 1909

Rutherford said a positive charge would be caused by one or more electrons being stripped from their around the nucleus.
http://www.answerbag.com/q_view/1829331#ixzz2vXLOuU00

Scrodinger and Hesienberg

Jan 1, 1920

These both proved that no experiment can measure the momentum of quantum of an particle. http://sites.google.com/site/theatombydancolella/home/start-of-the-atom/