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(i) What is meant by the term 'coordinat...

(i) What is meant by the term 'coordination number'?
(ii) What is the coordination number of atom: (a) in a cubic close-packed structure (b) in a body-centred cubic structure?

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(a) The co-ordination number of a constituent particle (atom, ion or molecule) is the number of nearest neighbours in its contact in the crystal lattice.
(b) (i) Twelve, (ii) Eight.
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