Assertion: potassium iodide's iodine | /r/HasProperty | so-called heavy element
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Source sentences:
text: Iodine is a micronutrient and dietary mineral that is naturally present in the food supply in some regions, especially near sea coasts, but is generally quite rare in the Earth's crust, since iodine is a so-called heavy element, and abundance of chemical elements generally declines with greater atomic mass.
text: Iodine is one of the heaviest elements needed by living things.