Tantalum
73
Ta
Gruppe
5
Periode
6
Blok
d
Protoner
Elektroner
Neutroner
73
73
108
Generelle Egenskaber
Atomnummer
73
Atommasse
180,94788
Masseantal
181
Kategori
Overgangsmetaller
Farve
Grå
Radioaktiv
Nej
Named after Tantalos, a Greek mythological character, father of Niobe
Krystalstruktur
Rumcentreret 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.
Elektroner i hver skal
2, 8, 18, 32, 11, 2
Elektronkonfiguration
[Xe] 4f14 5d3 6s2
Tantalum occurs principally in the mineral columbite-tantalite
Fysiske Egenskaber
Tilstandsform
Fast stof
Massefylde
16,654 g/cm3
Smeltepunkt
3290,15 K | 3017 °C | 5462,6 °F
Kogepunkt
5731,15 K | 5458 °C | 9856,4 °F
Smeltevarme
36 kJ/mol
Fordampningsvarme
735 kJ/mol
Varmefylde
0,14 J/g·K
Forekomst i jordskorpen
0,00017%
Forekomst i universet
8×10-9%
CAS-nummer
7440-25-7
PubChem CID-nummer
23956
Atomare egenskaber
Atomradius
146 pm
Kovalent radius
170 pm
Elektronegativitet
1,5 (Paulings skala)
Ioniseringspotentiale
7,5496 eV
Atomvolumen
10,90 cm3/mol
Varmeledningsevne
0,575 W/cm·K
Oxidationstrin
-1, 2, 3, 4, 5
Anvendelser
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