S10_Lecture2 - CHM 11500-S Blackboard...

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CHM 11500-S Blackboard: http://www.itap.purdue.edu/tlt/ ecourses Download lectures 1 and 2 from the Blackboard site. Study them. Watch the safety video and pass the Safety Quiz (Blackboard) before lab
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Approximately 10 –10 m Electrons, e (negative charge) Structure of the Neutral Atom
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Structure of the Neutral Atom Mostly empty space. Negative electrons. Positive nucleus. The tiny red dot is the size of the nucleus Nucleus is 10,000 times smaller than the overall atomic radius. Proton, p + (positive charge) Neutron, n 0 (no charge) Approximately 10 –14 m Atom’s radius
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Atomic Symbol How many nucleons are in a 19 F nucleus? 9 Mass number, # of protons + neutrons = # of nucleons Symbol Atomic number, number of protons 19 F 9
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Atoms and Molecules Atoms can combine by sharing electrons and form MOLECULES A structure consisting of two or more atoms that are chemically bound together and behave as an independent unit Molecules undergo CHEMICAL REACTIONS, either by themselves or with atoms or other molecules to create new molecules Equations describe reactions. Properly balanced equations have the same number and types of atoms in both the reactants and the products.
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