Textbook Notes (367,994)
CELL445 (7)
Chapter

# lecture28.pdf

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School
Department
Cell Biology
Course
CELL445
Professor
Bryan Hogeveen
Semester
Fall

Description
1 2 All those triangles in the last two lectures … Last time Speed Bump By Dave Coverly mass –3 Density = volume range 1 – 50 g cm bcc =r 3  or  = 4 r 4 3 2 4 fcc =r  or  = r 4 2 Read th 12.6, 12.7 till and including p. 461 (p. 483 5 ed.) (electronic materials, liquid crystals, ceramic materials) Practice PS #6. You can solve questions 1–5, 7–11 Tuesday Office hours 11:00 – 13:30 3 4 Ba crystallizes in a bcc structure and has a density of From the last lecture Fe problem (Fe is a bcc crystal) 3.62 g cm . What is the radius of a barium atom? Bcc means there are 2 atoms in the unit cell 3 r =  4 1 atom 8 corners + 1 center atom = 2 Ba atoms 8 corner So 3 –8 –8 r = 4 5.013 x 10 cm = 2.17 x 10 cm m Density = D = V –10 cube = 2.17 x 10 m = 217 pm m  = V cube = D Again reasonable. 137.3 g Ba 1 mol Ba 1 mol Ba 6.022 x 10 atoms Ba 2 atoms per cell Atomic radii are in the range of 50 to several hundred = –3 = 3.62 g cm picometers. –22 3 = 1.260 x 10 cm –8  = 5.013 x 10 cm 5 6 The crystal structure of MgO is similar to that of a) Coordination is the number of equidistant nearest 2+ Na2–. The ionic radius of Mg is 72pm and that of oppo
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