Which metal is heaviest - (1) osmium (2) mercury (3) iron (4) nickel

Which metal is heaviest - (1) osmium (2) mercury (3) iron (4) nickel
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(1) osmium Explanation: I assume by "heaviest," you mean "densest;" in that case, the densest chemical element is osmium (which is a metal). Osmium has a density of around 22 grams per cubic centimeter.
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