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Bromine and Mercury. However, they are not found in the elemental state but in compounds. In addition Gallium, Francium and Cesium are extremely cose to being liquid in their elemental form at normal temperatures and pressures.
Argon is a natural element found in the air.
Nobody knows for sure who discovered the elemnt mercury. Records show it was used in ancient Babylon, The chemist, Antoinne-Laurent de Lavoisier, is credited with identifying mercury as an element.
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Pure mercury will exhibit superconductivity at 4.2 degrees Kelvin. It was the first superconductive material that H. Kamerlingh Onnes found in 1911.