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Distinguish between crystal lattice and ...

Distinguish between crystal lattice and unit cell.

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Crystal lattice is the regular three dimensionsl arrangemtn of the points in a crystal. A unit cell is the smallest but complete unit of the crystal lattice which when repeated over and again in the three dimensions generates the crystal of the given substance.
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Distinguish between a. Hexagonal and monoclinic unit cells (b) Face-entred and end-centred unit cells

The regular three dimensional arrangement of points in a crystal is known as crystal lattice and the smallest repeating pattern in the lattice is called unit cell. The unit cells are characterised by the edge lengths a, b, c and the angles between them alpha, beta and gamma respectively. Based on this, there are seven crystal systems. In a cubic unit cell: a=b=c and alpha = beta=gamma=90^(@) The number of points in simple, body centred and face centred cubic cells are 1,2 and 4 respectively In both the hcp and ccp of spheres, the number of tetrahedral voids per sphere is two while the octahedral voids is one. In a face centred cubic cell, an atom at the face contributes to the unit cell