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In a close packed structure, the atoms s...

In a close packed structure, the atoms stack together occupying maximum space and leaving minimum vacant space. The close packing arrangment may be hcp (ABABA….) or ccp (ABCABCA….). In these arrangments, there is one octahedral void and two tetrahedral voids. Depending upon the ratio of size of cation and anion, the ions of one type occupy the voids of other ions. This results in different types of crystalline structures.
A metal oxide crystallises with metal ions in 2/3 of octahedral voids and 1/3 voids remain vacant in a closed packed array of oxide ions. What is the formula of metal oxide.

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`M_2O_3`
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