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In 1800, Volta invented the first true battery, the discipline of electrochemistry
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groupings: carbohydrates, proteins and lipids.
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Friedrich August Kekulé von Stradonitz proposes that carbon is tetravalent, or forms exactly four chemical bonds
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Lothar Meyer develops an early version of the periodic table, with 28 elements organized by valence
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Hermann Emil Fischer proposes structure of purine, a key structure in many biomolecules, which he later synthesized in 1898. Also begins work on the chemistry of glucose and related sugars.
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Alfred Werner discovers the octahedral structure of cobalt complexes, thus establishing the field of coordination chemistry
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William Ramsay discovers the noble gases, which fill a large and unexpected gap in the periodic table and led to models of chemical bonding.
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Ernest Rutherford discovers the source of radioactivity as decaying atoms; coins terms for various types of radiation
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Peter Debye develops the concept of molecular dipole to describe asymmetric charge distribution in some molecules
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Wolfgang Pauli develops the exclusion principle, which states that no two electrons around a single nucleus may have the same quantum state, as described by four quantum numbers