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Types of Crystalline Solids

33. Br- ions ...

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33. Br- ions form a close packed structure. If the radius of Br- ion is 195pm, calculate the radius of the cation that just fits into the tetrahedral hole. Can a cation A+ having a radius of 82pm be slipped into the octahedral hole of the crystal A+Br- ?

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B r^{-}

ions form a close packed structure. If the radius of

B r^{-}

195 p m

, calculate the radius of the cation that just fits into the teteahedral hole. Can a cation

A^{+}

having a radius of

82 p m

be shipped into be octathedral hole of the crystal

A^{+} B r^{-}

Q. If the radius of

B r^{-}

0.182 n m

, how large can a cation be fit in its tetrahedral holes?

A^{+}

B^{-}

N a C l

type closed packed structure. If the anion has a radius of

250 p m

, what should be the ideal radius of the cation?
Can a cation

C^{+}

having a radius of

180 p m

be slipped into the tetrahedral site of the crystal of

A^{+} B^{-}

, without disturbing the crystal ? Give reason for your answer.

Q. A crystalline solid

A B

N a C l

type structure with radius of

B^{-}

250 p m

. Which of the following cation can be made to slip into tetrahedral site of crystals of

A^{+} B^{-}

?

M g O

crystallizes in a cubic type crystal system. The ionic radii for

{M g}^{2 +}

O^{2 -}

0.066

0.140 n m

respectively. One can conclude that

{M g}^{2 +}

ions occupy :-
a) a cubic hole in a simple cubic structure.
b) every tetrahedral hole in a close packed structure.
c) an octahedral hole in a cubic close packed structure.
d) every other tetrahedral hole in a close packed structure.

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