Tantal
73
Ta
Gruppe
5
Periode
6
Blokk
d
Protoner
Elektroner
Nøytroner
73
73
108
Generelle egenskaper
Atomnummer
73
Atomvekt
180,94788
Massetall
181
Kategori
Transisjonsmetaller
Farge
Grå
Radioaktiv
Nei
Named after Tantalos, a Greek mythological character, father of Niobe
Krystallstruktur
Body Centered Cubic
Historie
Tantalum was discovered in Sweden in 1802 by Anders Ekeberg in the minerals tantalite from Finland and yttrotantalite from Sweden.
Unfortunately, William Hyde Wollaston claimed Ekeberg's new element was actually niobium, which had also been discovered in 1802.
In 1846, German chemist Heinrich Rose finally proved beyond doubt that tantalum and niobium were different elements.
Unfortunately, William Hyde Wollaston claimed Ekeberg's new element was actually niobium, which had also been discovered in 1802.
In 1846, German chemist Heinrich Rose finally proved beyond doubt that tantalum and niobium were different elements.
Elektroner per energinivå
2, 8, 18, 32, 11, 2
Elektronkonfigurasjon
[Xe] 4f14 5d3 6s2
Tantalum occurs principally in the mineral columbite-tantalite
Fysikalske egenskaper
Fase
Fast stoff
Tetthet
16,654 g/cm3
Smeltepunkt
3290,15 K | 3017 °C | 5462,6 °F
Kokepunkt
5731,15 K | 5458 °C | 9856,4 °F
Smeltevarme
36 kJ/mol
Fordampningsvarme
735 kJ/mol
Spesifikk varmekapasitet
0,14 J/g·K
Forekomst i jordskorpa
0,00017%
Forekomst i universet
8×10-9%
CAS Number
7440-25-7
PubChem CID Number
23956
Atomegenskaper
Atomradius
146 pm
Kovalent radius
170 pm
Elektronegativitet
1,5 (Pauling-skalaen)
Ioniseringsenergi
7,5496 eV
Molart volum
10,90 cm3/mol
Termisk ledningsevne
0,575 W/cm·K
Oksidasjonstilstander
-1, 2, 3, 4, 5
Bruksområder
Tantalum is used in the electronics industry for capacitors and high power resistors.
The high melting point and oxidation resistance lead to the use of the metal in the production of vacuum furnace parts.
Tantalum oxide is used to make special glass with high index of refraction for camera lenses.
The high melting point and oxidation resistance lead to the use of the metal in the production of vacuum furnace parts.
Tantalum oxide is used to make special glass with high index of refraction for camera lenses.
Tantalum is considered to be non-toxic
Isotoper
Stabile isotoper
181TaUstabile isotoper
155Ta, 156Ta, 157Ta, 158Ta, 159Ta, 160Ta, 161Ta, 162Ta, 163Ta, 164Ta, 165Ta, 166Ta, 167Ta, 168Ta, 169Ta, 170Ta, 171Ta, 172Ta, 173Ta, 174Ta, 175Ta, 176Ta, 177Ta, 178Ta, 179Ta, 180Ta, 182Ta, 183Ta, 184Ta, 185Ta, 186Ta, 187Ta, 188Ta, 189Ta, 190Ta