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Calculate the number of fornula units in...

Calculate the number of fornula units in each of the following types of unit cells:
(a) MgO in a rock salt type unit cell
(b) ZnS in zinc blende structure
(c) platinum in a face-centred cubic unit cell

Text Solution

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(a) 4 (the same as in NaCl) (b) 4 (c) 4 (1 at corner, 3 at the face-centres)
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Knowledge Check

  • In face -centered cubic unit cell, edge length is

    A
    `4/sqrt3` r
    B
    `4/sqrt2` r
    C
    2r
    D
    `sqrt3/2` r

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