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In the mineral, spinel, having the formu...

In the mineral, spinel, having the formula ` MgAl_(2)O_(4)` oxide ions ar arranged , in the cubic close packing, ` Mg^(2+)` ions occupy the tetrahedrel voids while `Al^(3+)` ions occupy the octahedral voids.
(i) What precnetage of tetrahedral voids is occupied by ` Mg^(2+) ` ions ?
(ii) What precentage of octahedral voids is occupied by ` Al^(3+)` ions ?

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