Week 3 notes
Week 3 notes CHEM 120
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This 1 page Class Notes was uploaded by Leslie Pike on Friday September 11, 2015. The Class Notes belongs to CHEM 120 at Western Kentucky University taught by Dr. Darwin Dahl in Summer 2015. Since its upload, it has received 66 views. For similar materials see College Chemistry I in Chemistry at Western Kentucky University.
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Date Created: 09/11/15
Week 3 Notes Chem 120 Important people to remember Democritus coined the name quotatomquot proposed that matter was composed of small indivisible particles Lavoisier studied conservation of mass burned things in jars and weighed the jar before and after to prove that no mass had been lost Mendeleev Periodic tabIe Stoney discovered electrons Rontgen Xrays JJ Thomson charge to mass ratio of electron IMPORTANT Rutherford alpha and beta radiation gold foil experiment discovery of the atomic nucleus Curie radioactivity Millikan charged oil drop experiment determined the weight of the electron Moseley modernday periodic table Aston Mass spectrometer Bohr electron shells De Broglie electrons behave as particles and waves both Neutrons and isotopes were discovered with the mass spectrometer The idea of neutrons was rst proposed by Chadwick who determined that the weight of the helium nucleus was twice what it ought to be Isotopes are different varieties of the same element They will have the same number of protons but different number of neutrons Hydrogen has three isotopes 1H 2H and 3H The number at the top indicates atomic mass which is the sum of protons and neutrons The number of protons is equal to the element s atomic number The number of electrons equals the number of protons UNLESS THE ATOM IS AN ION Positively charged ions are named by putting the word quotionquot after them ie quotSodium ion Calcium ionquot Negatively charged ions have an quotidequot ending Example uoride chloride oxide
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