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CHEM 123 (13)

Important Information and Helpful for Midterm #1

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Course Code
CHEM 123
William Power

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Unit Cell Coordination Number Atoms per Unit Cell Volume Occupied, % Simple Cubic (SC) 6 1 52 Body-Centered Cubic 8 2 68 (BCC) Hexagonal Closest 12 2 74 Packed (HCP) Face- Centered Cubic 12 4 74 (FCC) Structure Unit Cell Atoms per Unit Cell Ion Occupancy Sodium Chloride FCC 4 100% Cesium Chloride SC 1 - Zinc Blende FCC 4 50% Fluorite FCC 4 100% Holes Radius Ratio Trigonal Too small Tetrahedral < 0.225 Octahedral 0.414-0.732 Cubic > 0.732 Crystalline Solid Components Melt
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