Terbium

65
Tb
Grupp
n/a
Period
6
Block
f
Protoner
Electrons
Neutroner
65
65
94
Generella Egenskaper
Atomnummer
65
Atommassa
158,92535
Mass Number
159
Kategori
Lantanoider
Färg
Silver
Radioaktiv
Nej
Terbium was named after Ytterby, a town in Sweden
Kristallstruktur
Enkelt hexagonalt
Historia
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 skal
2, 8, 18, 27, 8, 2
Elektronkonfiguration
[Xe] 4f9 6s2
Tb
Terbium is soft enough to be cut with a knife
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
8,229 g/cm3
Smältpunkt
1629,15 K | 1356 °C | 2472,8 °F
Kokpunkt
3503,15 K | 3230 °C | 5846 °F
Smältvärme
10,8 kJ/mol
Ångbildningsvärme
295 kJ/mol
Specifik värmekapacitet
0,182 J/g·K
Abundance in Earth's crust
0,000093%
Abundance in Universe
5×10-8%
Pure
Bildkrediter: Images-of-elements
Pure terbium
CAS Number
7440-27-9
PubChem CID Number
23958
Atomära Egenskaper
Atomradie
177 pm
Kovalent radie
194 pm
Elektronegativitet
1,2 (Paulingskalan)
Jonisationspotential
5,8638 eV
Molvolym
19,20 cm3/mol
Värmeledningsförmåga
0,111 W/cm·K
Oxidationstillstånd
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
Stabila isotoper
159Tb
Instabila 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