Name: Mercury Symbol: Hg Atomic Number: 80 Atomic Mass: 200.59 amu Melting Point: -38.87 °C (234.28 K, -37.966 °F) Boiling Point: 356.58 °C (629.73 K, 673.844 °F) Number of Protons/Electrons: 80 Number of Neutrons: 121 Classification: Transition Metal Crystal Structure: Rhombohedral Density @ 293 K: 13.456 g/cm3 Color: Silver Date of Discovery: Known to the ancients Discoverer: Unknown Name Origin: After the planet Mercury Symbol Origin: From the Latin word hydrargyrum (liquid silver) Uses: thermometers, barometers, fluorescent lamps, batteries Obtained From: cinnabar ore