Which zinc group element has the lowest melting point?

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Periodic table — zinc group element Modern version of the periodic table of the elements (printable).

Among the elements of the zinc group (Group 12), mercury has the lowest melting point, at −38.83 °C. This makes it the only common metal that exists as a liquid at room temperature.1

For comparison, the melting points of the other members of the group are significantly higher: cadmium melts at 321.07 °C, and zinc melts at 419.53 °C.1