Tantal
73
Ta
Skupina
5
Perioda
6
Blok
d
Protoni
Elektroni
Neutroni
73
73
108
Opća svojstva
Atomski broj
73
Relativna atomska masa
180,94788
Maseni broj
181
Kategorija
Prijelazni metali
Boja
Siva
Radioaktivan
Ne
Imenovan po Tantalu, grčkom mitološkom liku, ocu Niobe
Kristalna struktura
Kubna prostorno centrirana
Povijest
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.
Elektrona po ljusci
2, 8, 18, 32, 11, 2
Elektronska konfiguracija
[Xe] 4f14 5d3 6s2
Tantalum occurs principally in the mineral columbite-tantalite
Fizikalna svojstva
Agregacijsko stanje
Čvrsto
Gustoća
16,654 g/cm3
Talište
3290,15 K | 3017 °C | 5462,6 °F
Vrelište
5731,15 K | 5458 °C | 9856,4 °F
Toplina taljenja
36 kJ/mol
Toplina isparavanja
735 kJ/mol
Specifični toplinski kapacitet
0,14 J/g·K
Zastupljenost u Zemljinoj kori
0,00017%
Zastupljenost u svemiru
8×10-9%
CAS broj
7440-25-7
PubChem CID broj
23956
Atomska svojstva
Atomski radijus
146 pm
Kovalentni radijus
170 pm
Elektronegativnost
1,5 (Paulingova ljestvica)
Potencijal ionizacije
7,5496 eV
Atomski volumen
10,90 cm3/mol
Toplinska vodljivost
0,575 W/cm·K
Stanja oksidacije
-1, 2, 3, 4, 5
Primjene
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
Izotopi
Stabilni izotopi
181TaNestabilni izotopi
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