Corrected entry: During the practice rounds, the question was asked about what was the densest element. The answer given was "Uranium" (19.1 g/cubic cm). The correct answer is Osmium with a density of 22.59 g/cubic cm).
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Correction: They asked which element was the heaviest, meaning the highest atomic weight. Uranium is correct.
Greg Dwyer
Neptunium and Plutonium have been discovered naturally in trace amounts as well, meaning that uranium is also incorrect if measuring atomic weight and not density.