Astatine Iodide, AtI, is the heaviest known interhalogen compound. To produce AtI, astatine should reacts with Iodine, where the mole ratio between AtI to polyatomic At is 2:1. If the yield is 100%, 321 g of polyatomic At will yield 515 g of AtI.How many atoms does a single molecule of polyatomic At has?   (MW, g/mol: At = 210, I = 126.9) *round off your answer to whole number

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