Tantal
73
Ta
Skupina
5
Perioda
6
Blok
d
Protoni
Elektroni
Nevtroni
73
73
108
Splošne lastnosti
Vrstno število
73
Atomska teža
180,94788
Masno število
181
Kategorija
Prehodne kovine
Barva
Siva
Radioaktivno
Ne
Named after Tantalos, a Greek mythological character, father of Niobe
Kristalna struktura
Telesno centrirana kubična
Zgodovina
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.
Elektroni po lupinah
2, 8, 18, 32, 11, 2
Razporeditev elektronov
[Xe] 4f14 5d3 6s2
Tantalum occurs principally in the mineral columbite-tantalite
Fizikalne lastnosti
Faza snovi
Trdnina
Gostota
16,654 g/cm3
Tališče
3290,15 K | 3017 °C | 5462,6 °F
Vrelišče
5731,15 K | 5458 °C | 9856,4 °F
Talilna toplota
36 kJ/mol
Izparilna toplota
735 kJ/mol
Toplotna kapaciteta
0,14 J/g·K
Zastopanost v Zemljini skorji
0,00017%
Zastopanost v vesolju
8×10-9%
CAS številka
7440-25-7
PubChem CID številka
23956
Atomske lastnosti
Atomski polmer
146 pm
Kovalentni polmer
170 pm
Elektronegativnost
1,5 (Paulingova lestvica)
Ionizacijski potencial
7,5496 eV
Atomski volumen
10,90 cm3/mol
Toplotna prevodnost
0,575 W/cm·K
Oksidacijska stanja
-1, 2, 3, 4, 5
Uporabe
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