Terbium

65
Tb
Gruppe
n/a
Periode
6
Blok
f
Protons
Electrons
Neutrons
65
65
94
General Properties
Atomnummer
65
Atommasse
158,92535
Mass Number
159
Kategori
Lantanider
Farve
Silver
Radioactive
Nej
Terbium was named after Ytterby, a town in Sweden
Krystalstruktur
Simpel Hexagonal
History
Terbium was discovered in 1843 by Swedish chemist Carl Gustaf Mosander, who detected it as an impurity in yttria.

Using ammonium hydroxide he precipitated fractions of different basicity from yttria.

In these fractions he found that the fraction that was essentially colorless in solution, but gave a brown-tinged oxide was terbium.
Elektroner i hver skal
2, 8, 18, 27, 8, 2
Elektronkonfiguration
[Xe] 4f9 6s2
Tb
Terbium is soft enough to be cut with a knife
Physical Properties
Tilstandsform
Fast stof
Massefylde
8,229 g/cm3
Smeltepunkt
1629,15 K | 1356 °C | 2472,8 °F
Kogepunkt
3503,15 K | 3230 °C | 5846 °F
Smeltevarme
10,8 kJ/mol
Fordampningsvarme
295 kJ/mol
Varmefylde
0,182 J/g·K
Abundance in Earth's crust
0,000093%
Abundance in Universe
5×10-8%
Pure
Billede akkrediteringer: Images-of-elements
Pure terbium
CAS Number
7440-27-9
PubChem CID Number
23958
Atomic Properties
Atomradius
177 pm
Kovalent radius
194 pm
Elektronegativitet
1,2 (Paulings skala)
Ionization Potential
5,8638 eV
Atomic Volume
19,20 cm3/mol
Varmeledningsevne
0,111 W/cm·K
Oxidationstrin
1, 3, 4
Applications
Terbium is used in alloys and in the production of electronic devices.

It is also used as a dopant for materials in solid-state devices and optical fibers.

Terbium oxide is in fluorescent lamps and TV tubes.

The brilliant fluorescence allows terbium to be used as a probe in biochemistry.
Terbium is considered to be moderately toxic
Isotoper
Stable Isotopes
159Tb
Unstable Isotopes
136Tb, 137Tb, 138Tb, 139Tb, 140Tb, 141Tb, 142Tb, 143Tb, 144Tb, 145Tb, 146Tb, 147Tb, 148Tb, 149Tb, 150Tb, 151Tb, 152Tb, 153Tb, 154Tb, 155Tb, 156Tb, 157Tb, 158Tb, 160Tb, 161Tb, 162Tb, 163Tb, 164Tb, 165Tb, 166Tb, 167Tb, 168Tb, 169Tb, 170Tb, 171Tb