The History of Chemistry
A Timeline
Ancient Greece: The philosopher Democritus states that everything in the universe is made of small indivisible atoms, this is the first mention of atoms. 
1661: Robert Boyle separates chemistry from alchemy in his book "The Skeptic Chemist" in which he also introduces elements, alkalis, and acids. 
1697: George Stahl introduces the theory of phlogiston, an element responsible for burning and rusting
1702: The existance of absolute zero is first suggested by Guilliame Amontos.  This is further expored by Lord Kelvin. 
1752: Thomas Melvil discovers that burning elements in a flame produces line spectra in the flame
1787: Claude Berthollet comes up with the idea of nommenclature in chemistry. 
1793: The first chemical society is formed in Philidephia, Pennsylvania
1799: The Law of Definite Proportions is set forth by Proust, which first introduces stoichiometry
1808: Dalton sets forth a modern Atomic Theory
1825: Faraday discovers the ever popular organic molecule, benzene
1828: The first organic compound, urea is synthesized from inorganic materials
1833: Michael Faraday makes electrochemstry more concrete as he sets forth new laws of electrolysis and coins modern terms.
1848: Louis Pasteur separates two isomers of tartaric acid, discovering stereochemistry. 
1858: Kekule and Couper discover that organic molecules are made mostly of chains of carbon atoms. 
1865: Kekule describes the ring structure of benzene
1869: The Periodic Table is published by Dmitri Mendeleev
1869: Friedrich Mieschler discovers DNA
1873:Van der Waals proposes the concept of "intermolecular forces" in liquids
1874: Kelvin formulates the Second Law of Themodynamics
1882: Gibbs and Helmholtz distinguishes between free and bound energy in chmical systems and formulates the Gibbs-Helmholtz equation. 
1885: Johann Balmer observes the line spectrum of hydrogen
1897: J.J. Thompson discovers that electrons are negatively charged particles, the first suggestion of sub-atimc particles
1898: Marie and Pierre Curie discover radioactive isotopes of radium and polonium
1898: Wien discovers a positively charged particle, laater called the proton
1900: Francios Grignard discovers organometallic reagents that can reduce adehydes and ketones to alcohols
1900: Max Planck hypothesizes that light exists in wavelike packets called quanta (photons) amd used this hypothesis to correctly analyze black body radiation
1905: Albert Einstien publishes his paper on the photoelectric effect,the first to apply Max Planck's light quanta hypothesis
1909: The pH scale for determining acidity was devised by Soren Sorensen
1911: Ernest Rutheford discovers the atomic nucleus
1912: Max von Laue uses X-ray diffraction to show that crystals have a structure of repeating atomic units
1913: Niels Bohr discribes a planetary model od the atom
1914: Rutheford discovers the proton
1916: Lewis describes the idea of covelent bonding
1920: Ernest Rutheford discusses the existance of the neutron in the atom
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