Skip links

Terbium (Tb): Fun Facts and Information About the Element

What is the symbol? Tb
What is the atomic number? 65
What is the atomic weight? 158.9253
What is the melting point in Celsius? 1360
What is the boiling point in Celsius? 3041
What is the density (g/cm3)? 8.23
What year was it discovered? 1843
Who discovered the element? Carl Gustaf Mosander
What group is the element in? 101
What is the electron configuration? [Xe] 4f9 6s2
What is the ionization energy? 5.8638
What element category is it in? Lanthanoids

Where is Terbium Found?

Terbium has been isolated only in recent years with the development of ion-exchange techniques for separating the rare-earth elements.

What is Terbium Used For?

Sodium terbium borate is used in solid-state devices. The oxide has potential application as an activator for green phosphors used in color TV tubes. Few other uses have been found.