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21 April, 09:44

Which of following unit cell has the smallest atomic packing factor? (a) BCC unit cell (b) FCC unit cell (c) SC unit cell (d) HCP unit cell

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  1. 21 April, 10:23
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    (c) SC unit cell

    Explanation:

    BCC (Body centered cubic) : In this one atom is present at center of the cell and one at each corner the packing factor of the BCC is 68% FCC (Face centered cubic) : In this one atom is present at the each faces and one at each corner the packing factor of FCC is 74 % SC (Simple cubic) : In this the atoms are present only at corner its packing factor is 52.4 % HCP (Hexagonal closed pack) its packing factor is 74.04 %

    So from above discussion it is clear that simple cubic has smallest packing factor
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