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Chemistry 2 Online
OpenStudy (clamin):

PLEASE HELP!! MEDAL & fan!! What are the importance of each scientists of their discovery on theory of atom. -Empedocles -John Dalton -J.J. Thomson -Niels Bohr

OpenStudy (aaronq):

http://atomictimeline.net/index.php

OpenStudy (photon336):

Well J.J. Thompson discovered the electron I believe, while bohr proposed a model that said that electrons orbit around the nucleus in the same way planets orbit the sun.

OpenStudy (photon336):

Dalton made contributions to atomic theory and the law of constant proportions that in chemical reactions, atoms interact in I believe fixed amounts. Empedocles was I guess the first person to actually talk about an element, but he mentioned things like fire, air, etc. @clamin

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