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It was formerly called hydraargyrum (/haɪˈdrɑːrdʒərəm/ hy-DRAR-jər-əm) and was commonly known as fast silver. Mercury, a heavy silver d-block element, is the only liquid metal element in standard temperature and pressure conditions; under these conditions, only bromine halogen liquids but melts with metals like caesium, rubidium and gallium just below room temperature.