Question: On the basis of ionic charge and ionic radii given in Table 12.3, predict crystal structures for the following materials: (a) CsI, (b) NiO, (c)

On the basis of ionic charge and ionic radii given in Table 12.3, predict crystal structures for the following materials:

(a) CsI,

(b) NiO,

(d) NiS.

Justify yourselections.

Ionic Radius Ionic Radius Cation (nm) Anion () 0.053 0.136 Br 0.196

Ionic Radius Ionic Radius Cation (nm) Anion () 0.053 0.136 Br 0.196 Ba2+ Ca+ Cs+ Fe2+ Fe+ K+ CI- 0.181 0.100 0.133 0.220 0.170 0.077 0.069 0.138 02- 0.140 0.184 Mg+ Mn2+ 0.072 0.067 Na+ Ni2+ Sit+ 0.102 0.069 0.040 0.061

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