Answer: Vanadium
Notes: The density (in kg/m3) of given metals is as follows : Lithium : 534; Vanadium : 5494; Iron : 7850; Gold : 19320. Under standard conditions, Lithium is the least dense of all elements that are solids at room temperature. Lithium can float on the lightest hydrocarbon oils and is one of only three metals that can float on water, the other two being sodium and potassium.
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