1. Tardigrade
  2. Question
  3. Chemistry
  4. In Chrysoberyl, a compound containing Beryllium, Aluminium and oxygen, oxide ions form cubic close packed structure. Aluminium ions occupy 1/4 text th of tetrahedral voids and Beryllium ions occupy 1/4 text th of octahedral voids. The formula of the compound is

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Q. In Chrysoberyl, a compound containing Beryllium, Aluminium and oxygen, oxide ions form cubic close packed structure. Aluminium ions occupy $1/4^\text{ th}$ of tetrahedral voids and Beryllium ions occupy $1/4^\text{ th}$ of octahedral voids. The formula of the compound is

KCETKCET 2021The Solid State

Solution:

$CCP = N =4$
Octahedral void $= N =1 \times 4=4 \times \frac{1}{4}=1: Be$
Tetrahedral void $=2 N =2 \times 4=2 \times \frac{1}{4}=2: A l$