The coordination number of BCC, FCC, CCP, HCP

Explanation :

Coordination number of any lattice point ,be it atom Or ion is defined as the number of nearest atoms or corresponding ions surrounding it.

Using this concept, coordination number (CN) of given packed structures are stated as follows:

a)CN of body-centred cubic (bcc)packed structure = 8

b) CN of face-centred cubic (fcc)packed structure =12

c) CN of cubic closed pack (ccp) structure =12

d) CN of hexagonal-closed pack(hcp)structure =12

Final Answer:

Hence, coordination number (CN)of given packed structures are stated as follows:

CN of bcc = 8

CN of fcc =12

CN of ccp =12

CN of hcp =12