Welcome to ChemZipper !!!: ANTIFLUORITE STRUCTURE (REVERE OF FLUORITE) Na2O:

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ANTIFLUORITE STRUCTURE (REVERE OF FLUORITE) Na2O:

The compound having A2B formula are compounds having anti fluorite structure :
Anti fluorite structure is having arrangement of cations and anions opposite to the fluorite structure Li2O has an anti fluorite structure.
(1)  In the crystal structure of Li2O, the O-2 ions constitute a cubic close packed lattice (fcc structure) and the Li+ ions occupy all the tetrahedral voids
(2)  Each oxide ion, O-2 ion is in contact with 8 Li+ ions and each Li+ ions having contact with 4 oxide ion. Therefore, Li2O has 4:8 coordination
(3) Stoichiometric ratio  of Na2O is 2:1
(4)  radius ratio , Packing efficiency, density and void %:
 Other Examples: – Na2O, K2O, K2S, Na2S, Rb2O, Rb2S
Note: Metals like Al, Ag, Au, Cu, Ni, and Pt have ccp structure and Be, Mg, Co and Zn have a hcp structure. And Noble gases (except He has a hcp structure) have ccp structure.

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