* Atomic number: 3

* Atomic weight: 6.941

* Melting point: 179 °C (354 °F)

* Boiling point: 1342 °C (2448 °F)

* Density: 0.534 g/cm³

* Hardness: 0.6 on the Mohs scale

* Color: Silvery white

* State at room temperature: Solid

* Electrical conductivity: 1.66×10^7 S/m

* Thermal conductivity: 85 W/(m·K)

* Specific heat capacity: 3.58 kJ/(kg·K)

* Young's modulus: 4.9 GPa

* Poisson's ratio: 0.33

* Bulk modulus: 11 GPa

* Shear modulus: 4.2 GPa

Lithium is the lightest metal and the least dense solid element. It is a very soft, silvery-white metal with a low melting point and boiling point. Lithium is a very reactive metal and rapidly tarnishes in air. It is the only alkali metal that is liquid at room temperature, although it is quite viscous and has a melting point of only 179 °C (354 °F). Lithium is also a good conductor of heat and electricity.