Theory:0.75 ZnS Actual: (Smallest CsCl(0.93) Cation/Anion) CsBr(0.87) Csci NaCl (Biggest Cation/Anion) (Intermediate Cation/Anion) X-13CsCl NaCl ZnS (Biggest Cation/Anion) (Smallest Cation/Anion) (Intermediate Cation/Anion) Theory: 0.75 Actual: CsCl (0.93) CsBr (0.87) XIII-13