13 Solid State Packing Efficiency of scc bcc fcc hcp ccp For Class 12th JEE IIT NEET Other Exam Vikr

Packing Efficiency|Packing Efficiency In SCC|Packing Efficiency In FCC|Packing Efficiency In BCC|Revision|OMR

In a close packed structure, the atoms stack together occupying maximum space and leaving minimum vacant space. The close packing arrangment may be hcp (ABABA….) or ccp (ABCABCA….). In these arrangments, there is one octahedral void and two tetrahedral voids. Depending upon the ratio of size of cation and anion, the ions of one type occupy the voids of other ions. This results in different types of crystalline structures. A metal crystallises into two cubic phases, fcc and bcc. Which phase has lesser packing efficiency and how much ?

In a close packed structure, the atoms stack together occupying maximum space and leaving minimum vacant space. The close packing arrangment may be hcp (ABABA….) or ccp (ABCABCA….). In these arrangments, there is one octahedral void and two tetrahedral voids. Depending upon the ratio of size of cation and anion, the ions of one type occupy the voids of other ions. This results in different types of crystalline structures. If edge length of a fcc unit cell of a metallic element is q, then the radius of an atom is ............. .