<P> Bismuth (III) iodide adopts a distinctive crystal structure, with iodide centres occupying a hexagonally closest - packed lattice, and bismuth centres occupying either none or two - thirds of the octahedral holes (alternating by layer), therefore it is said to occupy one third of the total octahedral holes . </P> <P> Bismuth (III) iodide forms upon heating an intimate mixture of iodine and bismuth powder: </P> <Dl> <Dd> 2Bi + 3I → 2BiI </Dd> </Dl> <Dd> 2Bi + 3I → 2BiI </Dd>

What is the chemical formula for the compound formed between bismuth(iii) and iodine
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