Properties of Crystalline solid | Symmetry and Habit of a crystal | ch#4 | 11th class chemistry

#propertiesofcrystallinesolids #Symmetry #habitofcrystal In this video I have discussed about the properties of crystalline solids One is Symmetry, Symmetry The repetition of faces, angles or edges when a crystal is rotated by 360° along its axis is called symmetry. This an important property of the crystal and there are various types of symmetry elements found in crystals like, center of symmetry, plane of symmetry and axis of symmetry, etc. and 2nd is Habit of a Crystal The shape of a crystal in which it usually grows is called habit of a crystal. Crystals are usually obtained by cooling the saturated solution or by slow cooling of the liquid substance. These are formed by growing in various directions. If the conditions for growing a crystal are maintained, then the shape of the crystal always remains the same. If the conditions are changed the shape of the crystal may change. For example, a cubic crystal of NaCl becomes needle like when 10% urea is present in its solution as an impurity.