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He was the first to conceive matter in the form of particles, which he called atoms.
(info found at www.chemistry.co.nz)
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Alchemists attempted to turn base metals into gold. This included simple metals, such as lead, into gold.
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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.
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He studied various acids and described the composition of many organic compounds, Lavoisier is often called the "father of chemistry".
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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)
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He made a model of an atom. It was a sphere made of positively charged material with negative electrons stuck in it.
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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 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) -
Performed the synthesis of compounds like cholesterol, quinene, chlorophyll, and cobalmin. He made many contributions to modern organic chemistry and studied various chemical reactions.
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