The Solid State

Short Answer Type

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What is meant by the term ‘coordination number’?

(ii) What is the coordination number of atoms:

(a) in a cubic close-packed structure?

(b) in a body-centred cubic structure?

Co-ordination number : The total number of nearest neighbour atoms of a particular atom in a crystal lattice is known as its co-ordination number.
Co-ordination number : The total number of nearest neighbour atoms of

Example: In hexagonal close-packing (hcp) arrangement, each particle is surrounded by 12 equidistant spheres, i.e., 6 spheres in contact with in the same plane and 3 each in adjacent layers-one immediately above and the other immediately below. This, co-ordination number in hcp packing is 12. 
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    Short Answer Type

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    Classify each of the following solids as ionic, metallic, molecular, network (covalent) or amorphous:

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    (ii) Ammonium phosphate (NH4)3PO4

    (iii) SiC

    (iv) I2 

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    (vi) Plastic

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