Terbium

65
Tb
Gruppe
I/T
Periode
6
Blokk
f
Protoner
Elektroner
Nøytroner
65
65
94
Generelle egenskaper
Atomnummer
65
Atomvekt
158,92535
Massetall
159
Kategori
Lantanoider
Farge
Sølv
Radioaktiv
Nei
Terbium was named after Ytterby, a town in Sweden
Krystallstruktur
Simple Hexagonal
Historie
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 per energinivå
2, 8, 18, 27, 8, 2
Elektronkonfigurasjon
[Xe] 4f9 6s2
Tb
Terbium is soft enough to be cut with a knife
Fysikalske egenskaper
Fase
Fast stoff
Tetthet
8,229 g/cm3
Smeltepunkt
1629,15 K | 1356 °C | 2472,8 °F
Kokepunkt
3503,15 K | 3230 °C | 5846 °F
Smeltevarme
10,8 kJ/mol
Fordampningsvarme
295 kJ/mol
Spesifikk varmekapasitet
0,182 J/g·K
Forekomst i jordskorpa
0,000093%
Forekomst i universet
5×10-8%
Pure
Bildekreditter: Images-of-elements
Pure terbium
CAS Number
7440-27-9
PubChem CID Number
23958
Atomegenskaper
Atomradius
177 pm
Kovalent radius
194 pm
Elektronegativitet
1,2 (Pauling-skalaen)
Ioniseringsenergi
5,8638 eV
Molart volum
19,20 cm3/mol
Termisk ledningsevne
0,111 W/cm·K
Oksidasjonstilstander
1, 3, 4
Bruksområder
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
Stabile isotoper
159Tb
Ustabile isotoper
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