Packing refers to the arrangement of constituent units in such a way that the forces of attraction among the constituent particles is maximum and the constituents occupy the maximum available space. In two -dimensions ,there are square close packing and hexagonal close packing .In three- dimensions ,however, there are hexagonal close packing, cubic close packing and body-centered cubic packing. (i) hcp:AB AB AB AB ..... arrangement ""coordination no. = 12 "" % occupied space = 74 (ii) ccp:ABC ABC.... arrangement lt brgt "" coordination no. = 12 ""% occupied space = 74 bcc:68% space is occupied ""coordination no.= 8 The closed packed lattice containing 'n' particles ,the numbers of tetrahedral and octahedral voids are:

Packing refers to the arrangement of constituent units in such a way t

1.	Packing refers to the arrangement of constituent units in such a way that the forces of attraction among the constituent particles is maximum and the constituents occupy the maximum available space. In two -dimensions ,there are square close packing and hexagonal close packing .In three- dimensions ,however, there are hexagonal close packing, cubic close packing and body-centered cubic packing. (i) hcp:AB AB AB AB ..... arrangement ""coordination no. = 12 "" % occupied space = 74 (ii) ccp:ABC ABC.... arrangement lt brgt "" coordination no. = 12 ""% occupied space = 74 bcc:68% space is occupied ""coordination no.= 8 The closed packed lattice containing 'n' particles ,the numbers of tetrahedral and octahedral voids are:
Answer» N,2n n,n 2n,n 2n,(n)/(2) ANSWER :C