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What Is the Heaviest Material Known to Man?

Answer

The heaviest material yet found is man-made ununoctium, or element 118. The heaviest naturally occurring element is Uranium. That is, if heavy is determined by atoms, atomic weight. If it is determined by density, osmium and iridium are the heaviest. The density of osmium is 2.61 g/cm3 and iridium is 22.65 g/cm3.
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