Chemistry - Solid State Question with Solution | TestHub

${\mathrm{B}\mathrm{a}\mathrm{F}}_2$is a ­$\mathrm{A}{\mathrm{X}}_2$type salt. In its crystal,${\mathrm{B}\mathrm{a}\mathrm{}}^{2+}$ions are arranged in ccp arrangement. Since there are two tetrahedral sites for each${\mathrm{B}\mathrm{a}\mathrm{}}^{2+}$ion and${\mathrm{F}}^{-}$ions occupy all the tetrahedral sites, hence one${\mathrm{F}}^{-}\mathrm{}$is surrounded by four${\mathrm{B}\mathrm{a}\mathrm{}}^{2+}$, i.e., the coordination number of${\mathrm{F}}^{-}$is 4.