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 empty space laft in three -dimensions is :

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 empty space laft in three -dimensions is :
Answer» `26%` `74%` `52.4%` `80%` ANSWER :A