Oct_17 - can be related to the atomic radius (r). Potassium...

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Closest Packed Unit Cells HCP CCP
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Cubic Unit Cells SC BCC FCC
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Cell Occupancy SC = 8 corners * 1/8 = 1 atom BCC = 8 corners * 1/8 + 1 middle * 1 = 2 atoms FCC = 8 corners * 1/8 + 6 faces * 1/2 = 4 atoms
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Metallic Structures Packing Coord # Atoms per Edge Unit Cell Length HCP CCP(FCC) BCC SC 12 2 a = 2 r 12 4 2 a = 4 r 8 2 3 a = 4 r 6 1 a = 2 r
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Cell Dimensions SC – touch on cell edge a = 2r FCC – touch on face diagonal (f) √2 a = 4r BCC – touch on body diagonal (b)√3 a = 4r a Cubic unit cell size
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Unformatted text preview: can be related to the atomic radius (r). Potassium (K) has a BCC structure and the unit cell edge length is 5.333 (1 = 10-10 m = 10-8 cm). Calculate the atomic radius of K and the density of metallic potassium. Atoms contact on body diagonal so 4 r = 3 a 4 r = 3 (5.333 ) r = 2.309 density = mass volume = 2 39.1 N a g 5.33 x 10 8 cm 3 = 0.857 g cm 3 There are 2 K atoms per unit cell...
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This note was uploaded on 01/20/2011 for the course CHEM 154 CHEM 154 taught by Professor Yang during the Spring '10 term at The University of British Columbia.

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Oct_17 - can be related to the atomic radius (r). Potassium...

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