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  4. The coordination number of the Ba 2 + ions is barium fluoride is 8. The coordination number of the fluoride ion is

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Q. The coordination number of the $Ba^{ 2 +}$ ions is barium fluoride is 8. The coordination number of the fluoride ion is

NTA AbhyasNTA Abhyas 2020The Solid State

Solution:

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