(i) Coordination number is the number of nearest neighbours around a particle.
(ii)
(a) coordination number of close-packed structure is 12
(b) coordination number of body centred cubic structure is 8
(i) Coordination number is the number of nearest neighbours around a particle.
(ii)
(a) coordination number of close-packed structure is 12
(b) coordination number of body centred cubic structure is 8