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Q. Define the crystal symmetry with reference to crystal structure.
Ans.CRYSTAL SYMMETRY: A crystal is an orderly array of atoms in space. Atoms organize themselves in an orderly, three-dimensional symmetrical patterns , in that rows can be identified running in various directions along which the atoms are regularly spaced .the lo9cation of the atoms and their particular arrangement in a given crystal are described by means of a space lattice, which is a three dimensional network to straight lines that acts as a coordinate system in space.thi8s shows the internal symmetry of a crystal because a definite pattern is repeated over and over again a\indefinite directions in the space. The external symmetry of a crystal corresponds with the internal symmetry of the crystal. The most important elements of external symmetry of a crystal are (a) A centre (b) An axis and (c) A plane.
A centre of symmetry is a point in the crystal such that any straight line through it, person through a pair of similar point situated at the same distance but on opposite sides of the center of symmetry.
1.defination 2.explain the mechanisms of each process. 3. explain in detail how many types of each process 4. advantages 5. disadvantages
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