The atomic radius of tungsten is 2.02Å, the atomic volume is 9.53cm3/mol, and the covalent radius is 1.3Å. It has a cubic body-centered crystal structure. Tungsten has an atomic mass of 183.85 and a density of 19.35 g/cc at 300K. It is a hard, silver-white metal that is generally obtained as a dull grey powder. Tungsten has various physical properties, including a boiling point of 5928K, coefficient of lineal thermal expansion of 4.59E-6/K-1, and thermal conductivity of 1.74 W/cmK. It also exhibits chemical properties such as an electrochemical equivalent of 1.1432g/amp-hr, an electron work function of 4.55eV, and an electronegativity of 2.36 (on the Pauling scale).