Terbium is a member of the lanthanide element family, with an atomic number of 65 and the element symbol Tb. It is located in the IIIB group of the sixth cycle and is a silver white metal. It is a rare earth metal and toxic. There is only one stable isotope in nature, and there are also 20 radioactive isotopes with a hexagonal lattice. They are soluble in dilute acids and react slowly with water. Has high reactivity. It should be stored in a container or vacuum container filled with inert gas.

Its compounds can be used as insecticides and also to treat skin diseases. The value of terbium and its many excellent properties place it in an irreplaceable position in some application fields. It is widely used in agriculture, industry, animal husbandry, medicine and health, high-tech industries, and other fields.