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History History Democritus - Democritus - First to use the term atom First to use the term atom Aristotle - Aristotle - Defined matter as composed Defined matter as composed of hot, cold, wet and dry of hot, cold, wet and dry John Dalton - John Dalton - Modern Atomic Theory and Modern Atomic Theory and Law of Multiple Proportions Law of Multiple Proportions Antoine Lavoisier - Antoine Lavoisier - Law of conservation Law of conservation of mass of mass Joseph Proust - Joseph Proust - Law of Definite Law of Definite Proportions Proportions J.J. Thomson - J.J. Thomson - Discovered the electron Discovered the electron with cathode ray experiment and with cathode ray experiment and proposed Plum pudding model proposed Plum pudding model Robert Millikan - Robert Millikan - Discovered the Discovered the charge/mass of the electron using Oil charge/mass of the electron using Oil Drop Experiment Drop Experiment

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  • HistoryDemocritus - First to use the term atom Aristotle - Defined matter as composed of hot, cold, wet and dryJohn Dalton - Modern Atomic Theory and Law of Multiple ProportionsAntoine Lavoisier - Law of conservation of massJoseph Proust - Law of Definite ProportionsJ.J. Thomson - Discovered the electron with cathode ray experiment and proposed Plum pudding modelRobert Millikan - Discovered the charge/mass of the electron using Oil Drop Experiment

  • Ernest Rutherford - Discovered the nucleus using gold foil experimentJames Chadwick - Discovered the neutron Henri Becquerel - discovered radiation emitted by UraniumMarie Curie - discovered two other elements that emitted radiation (Polonium and Radium)Niels Bohr - Proposed energy levels and the Planetary model of the AtomLouis de Broglie - Proposed the wave particle duality of nature Werner Heisenberg - Proposed the Uncertainty PrincipleErwin Schrodinger Proposed electron cloud model (quantum mechanical model) of an atom

  • John Newlands noticed pattern when elements were arranged by atomic mass (repeated every 8th element). He used the word periodic to describe this pattern and named it the Law of Octaves

    Lothar Meyer made a connection between atomic mass and properties of elements and made periodic table

    Dmitri Mendeleev made a connection between atomic mass and properties of elements and made periodic table. Also predicted unknown elements.

    Henry Mosely arranged periodic table by atomic number and gave us Periodic Law

  • Four parts of an experimentIndependent variable what the scientist changes, what is being tested.Dependent variable what changes because of the independent variable.Control the comparison item, it is used to see if the independent has an effect (usually a sample with no independent used)Constants everything else that is in the experiment that we keep constant

  • 5 Branches of ChemistryOrganic Carbon containing compoundsInorganic compounds that do not contain carbonAnalytical analyze compounds to determine compositionPhysical combines chemistry with physical to explain what happens when reactions occurBiochemical combines chemistry with biology to explain why life occurs on a molecular level


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