Atomic Number: 3

Atomic Weight: 6.941

Melting Point: 453.65 K (180.50°C or 356.90°F)

Boiling Point: 1615 K (1342°C or 2448°F)

Density: 0.534 grams per cubic centimeter

Phase at Room Temperature: Solid

Element Classification: Metal

Period Number: 2

Group Number: 1

Group Name: Alkali Metal

Li-7 is used to control the pH level of the coolant in the primary water circuit of pressurized water reactors. Li-7 is also used for the production of the medical research radioisotope Be-7. Li-6 is used in thermonuclear weapons and the export and use of Li-6 is therefore strictly controlled. Li-6 can also be used for the production of the radioisotope H-3, which is used in biochemistry research.