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Define the following terms in relation to crystalline solids . (i) Unit cell (ii) Coordination number . Give one example in each case

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A)
Solution :
Unit cell : A unit cell is the smallest portion of a crystal lattice which when repeated in different direction , generates the entire lattice .
Coordination number : The number of nearest neighbour of any constituent particle in a packing is called its coordination number .
The coordination number of an atom in the bcc structure is 8.
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