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Explain briefly seven types of unit cell. Seven types of unit cell,

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SOLUTION :(i) Cubic- `NaCl`
(ii) Tetragonal- `TIO_(2)`
(III) Orthorhombic - `BaSO_(4)`
(iv) Hexagonal- `ZnO`
(v) Monoclinic - `PbCrO_(4)`
(vi) Triclinic - `H_(3)BO_(3)`
(VII) Rhombohedral- Cinnabar
They differ in the arrangement of their crystallographic axes and angles.
Corresponding to the above seven, Bravis defined 14 possible crystal system as shown in the FIGURE.


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