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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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Contibution by two atoms present on one body diagonal =2
Contribution by four atoms present on four body diagonals =8
Contribution by the atoms present on the corners =1
Total no. of atoms per unit cell`=8+1=9`
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