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courundum composed by aluminium and oxygen . oxides ions are arranged in h.c.p whearas auminium ions occupy 2/3 of total octahedral void. find formula of solids

courundum composed by aluminium and oxygen . oxides ions are arranged in h.c.p whearas auminium ions occupy 2/3 of total octahedral void. find formula of solids

Grade:12

1 Answers

Arun
25750 Points
6 years ago
In ccp or hcp packing there is one octahedral void corresponding to each atom constituting the close packing. In corundum only 2/3rd of the octahedral voids are occupied. It means corresponding to each oxide are 2/3 aluminium ions. The whole number ratio of oxide and aluminium ion in corundum is therefore 3:2 Hence formula of corundum is Al2O3

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