Tantal
73
Ta
Grupă
5
Perioadă
6
Bloc
d
Protoni
Electroni
Neutroni
73
73
108
Proprietăți Generale
Număr atomic
73
Masă atomică
180,94788
Numar de masa
181
Categorie
Metale de tranziție
Culoare
Gri
Radioactive
Nu
Numit după Tantalos, un personaj mitologic grec, tatăl lui Niobe
Structură cristalină
Corp Centrat Cubic
Istoric
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.
Electroni pe nivelul de energie
2, 8, 18, 32, 11, 2
Configurație electronică
[Xe] 4f14 5d3 6s2
Tantalum occurs principally in the mineral columbite-tantalite
Proprietăți Fizice
Fază
Solid
Densitate
16,654 g/cm3
Punct de topire
3290,15 K | 3017 °C | 5462,6 °F
Punct de fierbere
5731,15 K | 5458 °C | 9856,4 °F
Energie de fuziune
36 kJ/mol
Energie de evaporare
735 kJ/mol
Căldură specifică
0,14 J/g·K
Abundența în scoarța Pământului
0,00017%
Abundența în Univers
8×10-9%
Numarul CAS
7440-25-7
Număr CID PubChem
23956
Proprietăți Atomice
Rază atomică
146 pm
Rază de covalență
170 pm
Electronegativitate
1,5 (Scara lui Pauling)
Potențial de ionizare
7,5496 eV
Volum molar
10,90 cm3/mol
Conductivitate termică
0,575 W/cm·K
Număr de oxidare
-1, 2, 3, 4, 5
Aplicații
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
Izotopi stabili
181TaIzotopi instabili
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