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b) Atoms of element B form hep lattice a...

b) Atoms of element B form hep lattice and those of element A occupies `2//3^(rd)` of tetrahedral voids. Calculate the formula of the compound formed by A and B. 

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B form hcp lattice
A occupies `2//3^("rd")` of tetrahedral voids
`A:B`
`2(2//3):1`
`4//3:1`
`A_(4)B_(3)" is the formula of the compound."`
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