Tb

Terbium

Identification

CAS Number: 7440-27-9

Discovery Year: 1843

Discoverer: Carl Mosander

Discovery Location: Sweden

Properties

Atomic Mass: 158.92535 →Density: 8.23 g/cm³ →

Crust Abundance: 1.2 mg/kg

Crystal Structure: HEX

Atomic Dimensions

Atomic Radius: 175 pm →

Atomic Radius (Rahm): 276 pm

Covalent Radius: 194 pm →

Van der Waals Radius: 233 pm

Atomic Volume: 19.2 cm³/mol

Lattice Constant: 3.6 Å

Thermodynamics

Melting Point: 1629 K →Boiling Point: 3296 K →Specific Heat: 0.183 J/(g·K) →Thermal Conductivity: 11.1 W/(m·K) →Heat of Vaporization: 389 kJ/mol →

Heat of Formation: 388.7 kJ/mol

Electronic Structure

Electron Config: [Xe] 4f9 6s2

Block: f

Period: 6 →Electron Affinity: 1.165 eV →

Oxidation States: +3, +4

Abundance & Geochemistry

Crust Abundance: 1.2 mg/kg

Sea Abundance: 1.4e-7 mg/L

Geochemical Class: rare earth & related

Goldschmidt Class: litophile

About

Silvery metallic element belonging to the lanthanoids. Tb-159 is the only stable isotope, there are seventeen artificial isotopes. Discovered by G.G. Mosander in 1843.

Isotopes

Tb-159 159 100.00%