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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 struc

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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
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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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