Given : Radius of A²⁺ = 100 pm; Radius of C⁺ = 240 pm; Radius of B^2- = 300 pm; Radius of D^- = 480 pm. Which is / are correct statement?

$\frac{{\mathrm{r}}_{{\mathrm{A}}^{2+}}}{{\mathrm{r}}_{{\mathrm{B}}^{2-}}}=\frac{100}{300}=0.333\frac{{\mathrm{r}}_{{\mathrm{C}}^{+}}}{{\mathrm{r}}_{{\mathrm{D}}^{-}}}=\frac{240}{480}=0.5$

${\mathrm{B}}^{2-} \mathrm{are} \mathrm{at} \mathrm{F}.\mathrm{C}.\mathrm{C}. {\mathrm{D}}^{- }\mathrm{at} \mathrm{F}.\mathrm{C}.\mathrm{C}.\mathrm{latticepoint}$

and A²⁺ ion are C⁺ in all octahedral voids alternate tetrahedral void

C.No. of AB = 4 : 4          C.No. of CD = 6 : 6