Problem: An ionic compound forms when calcium (Z = 20) reacts with iodine (Z = 53). If a sample of the compound contains 7.4×1021 calcium ions, how many iodide ions does it contain?

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An ionic compound forms when calcium (Z = 20) reacts with iodine (Z = 53). If a sample of the compound contains 7.4×1021 calcium ions, how many iodide ions does it contain?

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