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AIIMS AIIMS Solved Paper-2005

  • question_answer
    If z is the number of atoms in the unit cell that represents the closest packing sequence... .A B C ABC..... the number of tetrahedral voids in the unit cell is equal to:

    A) Z                             

    B)        2Z                          

    C) Z/2                                        

    D) Z/4

    Correct Answer: B

    Solution :

    ABC ABC ..... arrangement of layers is found in cubic closed pack system (CCP system). In this there are at the corner as well as centre of the unit cell. \[\therefore \]number of atoms per unit cell \[=8\times \frac{1}{8}+1=2\] \[\Rightarrow \] number of tetrahedral voids in a unit cell =2Z.


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