MS115a Lect 06 10 07 2011

MS115a Lect 06 10 07 2011 - Types of Primary Chemical Bonds...

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Metallic Electropositive: give up electrons Ionic Electronegative/Electropositive Colavent Electronegative: want electrons Shared electrons along bond direction Types of Primary Chemical Bonds Isotropic, filled outer shells + - + - + - + - + + + + + + + + + + e- e- e- Close-packed structures
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Metals
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cation anion Ionic Compounds
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Covalent Compounds s 2 p 2 s 2 p 1 s 2 p 3 sp 3 s 2 s 2 p 4
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Formal Crystallography Crystalline Periodic arrangement of atoms Pattern is repeated by translation Three translation vectors define: Coordinate system Crystal system Unit cell shape Lattice points Points of identical environment Related by translational symmetry Lattice = array of lattice points a b c α β γ • space filling • defined by 3 vectors • parallelipiped • arbitrary coord system • lattice pts at corners +
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hcp ccp (fcc) bcc Hexagonal unit cell Specify: a , c Hexagonal implies: | a 1 | = | a 2 | = a γ
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MS115a Lect 06 10 07 2011 - Types of Primary Chemical Bonds...

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