Crystals

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Crystals

  1. 1. Ryan Ali M. CatagaChemistrySir Joel
  2. 2. The angles between the surfaces are alwaysexactly 90 degrees.This idea began with NICOLAUS STENO in thelate 1669His observations have been extended toIntensive Properties Extensive Propersties ofFill Sample Crystals may vary Sample Fill While intensive properties remain the same Fill Sample Fill Sample
  3. 3. A rigid bodies in which the particles are arranged in unitswhich form a repeating pattern The study of Solid State is the study of Crystals They can’t be seen in our eyes All crystals are made with similar small units Crystals form by repetition of identical units CRYSTALS HAVE SEVEN SHAPES
  4. 4. 543 People Students2 Chemists10 1669 1788 1983 2012
  5. 5. Length of the Unit Cell Angles Between the Crystal System Axes Unit Cell Axes All equal All = 90 degrees Cubic 2 Equal All = 90 degrees Tetragonal 1 Unequal 3 Equal 1 = 90 degrees Hexagonal 1 Unequal 3 = 60 degrees All equal All ≠ 90 degrees Rhombohedral All unequal All = 90 degrees Orthorombhic All unequal 2 = 90 degrees Monoclinic 1 = ≠ 90 degrees All unequal All ≠ 90 degree Triclinic

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