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Terbium

Metalsolid
Symbol: Tb
Atomic number: 65
Atomic mass: 158.92534
Group: Lanthanide
CAS-number: 7440-27-9

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Physical data
Isotopes
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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 27, 8, 2
Orbitals: [Xe] 4f9 6s2
Electronegativity: --, 1.1
1. Ionization potential: 5.8639 eV
2. Ionization potential: 11.525 eV
3. Ionization potential: 21.91 eV
Oxidation states: 4, 3
Electrical conductivity: 0.00889 10^6
Melting point: 1356 °C
Boiling point: 3230 °C
Specific heat: 0.18 J/gK
Heat of fusion: 10.80 kJ/mol
Heat of vaporization: 330.90 kJ/mol
Thermal conductivity: 0.111 W/cmK
Atomic radius: 2.51 Å
Ionic radius: 1.18 Å (+3)
Covalent radius: 1.59 Å
Atomic volume: 19.2 cm³/mol
Density (293 K): 8.27 g/cm³
Crystal structure: hexagonal
hexagonal

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
151Tb 0 151 1/2 17.61h EC, β+, α View
155Tb 0 155 3/2 5.3d EC View
156Tb 0 156 3 5.3d EC View
157Tb 0 157 3/2 1.1E02y EC View
158Tb 0 158 3 1.8E02y EC, β- View
159Tb 100 159.925 3/2 -- --
160Tb 0 160 3 72.3d β- View
161Tb 0 161 3/2 6.91d β- View
162Tb 0 162 1 7.6m β- View

Other info

Name origin:Named after Ytterby, a village in Sweden.
Description:Soft, ductile, silvery-gray, rare earth metal.
Discovered by:Carl Mosander
Year:1843
Place:Sweden
Sources:Found with other rare earths in monazite sand, which typically contain 0.03% terbium. Other sources are xenotime and euxenite, both of which are oxide mixtures that can contain up to 1% terbium.
Use(s):It is used in modest amounts in special lasers and solid-state devices.