Question
what are d cordination no. of NaCl, ZnS, CsCl, CaF2,,Li2O upto four places, is there any trick to remember all these?
Joshi sir comment
NaCl fcc structure 6 for Na and 6 for Cl
ZnS In ZnS , S forms the face centered cube and Zn occupies half of the tetrahedral holes..The unit cell can be devided into eight equal small cubes,each with 1 Zn and 4 S ions so the coordination no will be 4 for Zn and 4 for S
CsCl bcc structue 8 for Cs and 8 for Cl
CaF2 fcc structure of Ca with 100% filled tetrahedral voids by F, so coordination no. of Ca is 8 and that of F is 4
Li2O anti fluorite structure, fcc structure of O with 100% filled tetrahedral voids by Li so coordination of O is 8 and that of Li is 4