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3_Minerals_part 2 - GEO 303 Lecture 3 Minerals(continued...

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GEO 303, Lecture 3 Minerals (continued) Announcements Chemistry, continued Quick Chemistry Chemical bonds Silicate minerals Other rock forming minerals Igneous Rocks January 25 th  and 26th , 2011 Next lecture : Igneous Rocks, Finish Ch 5 Next lab : Finish Ch 4, Texas Memorial Museum Trip
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Periodic table : Elements in order of atomic number (# of protons) Rows: # of electron shells Columns: # of electrons in outer shell Quick Chemistry Quick Chemistry
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Chemical reaction : interaction of atoms to form compounds Molecule : group of atoms that forms smallest, individual unit in a compound Chemical formula : gives relative proportions of atoms or ions in compound (ex. H 2 O, CaCO 3 , SiO 2 , NaCl) Chemical Reactions Chemical Reactions
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Chemical bonds : interactions of atoms/molecules hold compounds together 2 types... 1. Ionic bond : ions of opposite charge attract 2. Covalent : atoms share electrons to fill outer shells Chemical Bonds Chemical Bonds
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Sodium loses one electron… …and chlorine acquires it. Electrical attraction Sodium atom Chlorine atom Cation (+) Anion (–) Minerals: Minerals: Ionic Bonds Ionic Bonds Halite  (NaCl)
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Ionic Bonds Ionic Bonds Ions vary in size, anions (negative ions) are usually big compared to cations (postive ions) Anions generally determine crystal properties Molecules can be charged ions too, Ex. SiO 4 4-
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