Tantaali
73
Ta
Ryhmä
5
Jakso
6
Lohko
d
Protonia
Elektronit
Neutronia
73
73
108
Yleiset ominaisuudet
Järjestysluku
73
Atomipaino
180,94788
Massaluku
181
Luokka
Siirtymäalkuaineet
Väri
Harmaa
Radioaktiivisuus
Ei
Named after Tantalos, a Greek mythological character, father of Niobe
Kiderakenne
Tilakeskinen kuutiollinen
Historia
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.
Elektroneja elektronikuorilla
2, 8, 18, 32, 11, 2
Orbitaalirakenne
[Xe] 4f14 5d3 6s2
Tantalum occurs principally in the mineral columbite-tantalite
Fyysiset ominaisuudet
Olomuoto
Kiinteä
Tiheys
16,654 g/cm3
Sulamispiste
3290,15 K | 3017 °C | 5462,6 °F
Kiehumispiste
5731,15 K | 5458 °C | 9856,4 °F
Sulamislämpö
36 kJ/mol
Höyrystymislämpö
735 kJ/mol
Ominaislämpökapasiteetti
0,14 J/g·K
Esiintyvyys maankuoressa
0,00017%
Esiintyvyys maailmankaikkeudessa
8×10-9%
CAS-numero
7440-25-7
PubChem CID-numero
23956
Atomiominaisuudet
Atomisäde
146 pm
Kovalenttisäde
170 pm
Elektronegatiivisuus
1,5 (Paulingin asteikko)
Ionisoitumispotentiaali
7,5496 eV
Moolitilavuus
10,90 cm3/mol
Lämmönjohtavuus
0,575 W/cm·K
Hapetusluvut
-1, 2, 3, 4, 5
Käyttö
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
Isotooppi
Vakaat isotoopit
181TaEpävakaat isotoopit
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