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Calculate the number of atoms in a cubic...

Calculate the number of atoms in a cubic based unit cell having one atome on each corner and two atoms on each body diagonal.

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The correct Answer is:
9
There are four body diagonals .Thus, there are 8 atoms within the body of the unit cell which are not shared by any other unit cell. Contribution by atoms at the corners =`8xx1/8=1`
hence, total atoms/unit cell =8+1=9
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