Question

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

Answer 1

Unit cell :- The smallest group of atoms which has the overall symmetry of Crystal.

Coordination number :-The number of atoms or ions immediately surrounding a central atom in a crystal.

Answer 2

1) Unit cell : the basic structural unit which on repeating in space generates the entire lattice

eg: bricks

2) coordination number : the number of nearest neighbours of any constituent

eg: hcp

by:

SVP2

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