In corundum, oxide ions are arranged in h.c.p array and the aluminium ions occupy two thirds octahedral voids. What is the formula of corundum?
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Solution
In corrundum only 23 of octahedral voids are occupied. It means that corresponding to each oxide ion there are 23 aluminium ions. The whole number ratio of oxide and aluminium ion in corrundum is therefore 3 : 2.