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Unformatted text preview: Chem 109 Isotopes / Average Atomic Mass / Nuclear Equations These are the names we're given Disturbed Land of Confusion History Lesson: Know: Scientist, what he did, why, how, and the significance J.J. Thomson, Robert Millikan, Ernest Rutherford (his lecture slides gave you everything he wants you to know here) Atomic Mass elements are determined by # of protons in nucleus # indicated by Z aka atomic number What are the following elements? (Give symbol and name) Number of protons is 6 ___ protons 24 ___ protons 48 ___ protons 74 ___ Add protons and neutrons in nucleus to get mass A neutral atom as the same number of protons and electrons In an ion, p + - e- = charge Problem: The position of an element in the periodic table is a function of its atomic composition. Elements are arranged in order of increasing atomic number. atomic composition....
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