Chemistry

Problem

Four hypothetical ionic solids adopt the general formula MX. Their cation and anion radii are listed. • Solid A:

r_{\text{M}^+}=1.90\,\text{Å}

r_{\text{X}^-}=1.80\,\text{Å}

• Solid B:

r_{\text{M}^+}=0.60\,\text{Å}

r_{\text{X}^-}=2.00\,\text{Å}

• Solid C:

r_{\text{M}^+}=1.04\,\text{Å}

r_{\text{X}^-}=1.35\,\text{Å}

• Solid D:

r_{\text{M}^+}=0.90\,\text{Å}

r_{\text{X}^-}=1.35\,\text{Å}

Which solid is most likely to crystallize in the eight-coordinate CsCl-type lattice? a) Solid D b) Solid A c) Solid C d) Solid B