Tantal
73
Ta
Gruppe
5
Periode
6
Blokk
d
Proton
Elektron
Nøytron
73
73
108
Generelle eigenskapar
Atomnummer
73
Atommasse
180,94788
Massetal
181
Kategori
Transisjonsmetall
Farge
Grå
Radioaktiv
Nei
Named after Tantalos, a Greek mythological character, father of Niobe
Krystallstruktur
Romsentrert kubisk
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.
Elektron per energinivå
2, 8, 18, 32, 11, 2
Elektronkonfigurasjon
[Xe] 4f14 5d3 6s2
Tantalum occurs principally in the mineral columbite-tantalite
Fysiske eigenskapar
Tilstandsform
Fast stoff
Tettleik
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
Fordampingsvarme
735 kJ/mol
Spesifikk varmekapasitet
0,14 J/g·K
Førekomst i jordskorpa
0,00017%
Førekomst i universet
8×10-9%
CAS-nummer
7440-25-7
PubChem CID-nummer
23956
Atom eigenskapar
Atomradius
146 pm
Kovalent radius
170 pm
Elektronegativitet
1,5 (Paulings skala)
Ioniseringspotensial
7,5496 eV
Molart volum
10,90 cm3/mol
Termisk konduktivitet
0,575 W/cm·K
Oksidasjonstrinn
-1, 2, 3, 4, 5
Bruksområde
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
Isotopar
Stabile isotopar
181TaUstabile isotopar
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