Periodic System for Chemists

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Table
65
158.93

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%

Related Elements

Category

Lanthanides

Same Period

62 Sm Samarium63 Eu Europium64 Gd Gadolinium66 Dy Dysprosium67 Ho Holmium68 Er Erbium

Periodic Trends

Electronegativity →Atomic Radius →Density →Melting Point →

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