-
465
Democritus
He was the first to conceive matter in the form of particles, which he called atoms.
(info found at www.chemistry.co.nz)
(picture found at www.artsunlight.com) -
Jan 1, 1000
Alchemy
Alchemists attempted to turn base metals into gold. This included simple metals, such as lead, into gold.
(info found at ezinearticles.com)
(picture found at monex.com) -
18th Century = Very Important
During this time frame many new elements were discovered. The foundations of both electrochemistry and organic chemistry were laid, and scientists began to try and organize matter.
(info at yourtranslationservice.com) -
A.L. Lavoisier
He studied various acids and described the composition of many organic compounds, Lavoisier is often called the "father of chemistry".
(Info at ezinearticles.com)
(photo at factsworthknowing.blogspot.com) -
Dalton
In 1803 Dalton publishes his atomic theory which states that all matter is composed of atoms and that those atoms are small and indivisible.
(info at www.columbia.edu)
(picture at universetoday.com) -
Thompson
He made a model of an atom. It was a sphere made of positively charged material with negative electrons stuck in it. -
Rutherford
He discoered that there are 3 types of radioactivity: positive, negative, and neutral particles. He believed that an atom was primarily empty space, and that electrons surround the positively charged nucleus at high speeds.
(info at www.columbia.edu -
Bohr
Bohr came up with the rule that electrons can only follow their own "special" orbits and that energy can only change in little jumps.
(info at www.colorado.edu) -
Robert Croodwart
Performed the synthesis of compounds like cholesterol, quinene, chlorophyll, and cobalmin. He made many contributions to modern organic chemistry and studied various chemical reactions.
(info at ezinearticles.com)
(picture at e-ducation.net)
