Crystalline Structure. Unit Cells The kind of symmetry found throughout a crystalline substance is determined by the type of unit cell which generates.

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Presentation transcript:

Crystalline Structure

Unit Cells The kind of symmetry found throughout a crystalline substance is determined by the type of unit cell which generates the lattice structure. Simple cubic Body-centered cubic Face-centered cubic Monoclinic HexagonalTetragonal

Simple cubic Body-centered cubic Face-centered cubic

Cubic

Body-Centered Cubic

Face-Centered Cubic

Copyright © 2007 Pearson Benjamin Cummings. All rights reserved.

Phosphorous (P 4 ) TWO ALLOTROPIC FORMS White phosphorous spontaneously ignites Red phosphorous used for matches Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 457

Sodium Chloride Crystal Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 455 = Cl - = Na +

Packing of NaCl Ions Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 456 = Na 1+ = Cl 1-

Packing of NaCl Ions Electron Microscope Photograph of NaCl

Molecular Structure of Ice Hydrogen bonding Zumdahl, Zumdahl, DeCoste, World of Chemistry  2002, page 455