Mercury was found in Egyptian tombs that date from 1500 BC. The liquid element mercury was isolated by the ancient Chinese and the Egyptians, probably from the mineral cinnabar (mercuric sulfide).
Atomic number: 80
Atomic weight: 200.59
Group, period, block: 12, 6, d
Classification: transition metal
Electron configuration: 4f14 5d10 6s2
Density: 13.534 g/cm-3
Melting point: 234.32 K,-38.83 °C,-37.89 °F
Boiling point: 629.88 K,356.73 °C,674.11 °F
Oxidation states: 4, 2 (mercuric), 1 (mercurous)
Electronegativity: 2.00 (Pauling scale)
Ionization energies: 1st: 1007.1 kJ·mol-1
Covalent radius: 132±5 pm
Van der Waals radius: 155 pm
There are seven naturally occurring isotopes of mercury exist, 196Hg, 198Hg, 199Hg, 200Hg, 201Hg, 202Hg, and 204Hg.