Tantaali

Kemiallinen merkki: Ta
Järjestysluku: 73
Kategoria: siirtymämetallit
Ryhmä: 5
Jakso: 6
Lohko: d
Moolimassa: 180,94788 g/mol
Elektronia kuorilla: 2, 8, 18, 32, 11, 2
CAS-numero: 7440-25-7
Olomuoto: kiinteä
Tiheys: 16,69 kg/l (lähellä huoneenlämpöä)
Sulamispiste: 3290 K (3017 °C, 5463 °F)
Kiehumispiste: 5731 K (5458 °C, 9856 °F)
Kiderakenne: cubic body centered
Hapetusluvut: 5, 4, 3
Elektronegatiivisuus: 1,5 (Pauling-asteikko)
Nimen alkuperä: Tantalus
Nimen tarkoitus: the father of the goddess Niobe in Greek mythology
Faktoja:
- many contemporary chemists believed niobium and tantalum were the same elements until 1844
- is dark, dense, ductile, very hard, easily fabricated, and highly conductive of heat and electricity
- is highly corrosion-resistant and occurs naturally in the mineral tantalite
- its main use today is in tantalum capacitors, but it's also used in laboratory equipment