Tantal

73
Ta
Skupina
5
Perioda
6
Blok
d
Protons
Electrons
Neutrons
73
73
108
General Properties
Vrstno število
73
Atomska teža
180,94788
Mass Number
181
Kategorija
Prehodne kovine
Barva
Gray
Radioactive
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.
Electrons per shell
2, 8, 18, 32, 11, 2
Razporeditev elektronov
[Xe] 4f14 5d3 6s2
Ta
Tantalum occurs principally in the mineral columbite-tantalite
Physical Properties
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
Abundance in Earth's crust
0,00017%
Abundance in Universe
8×10-9%
Tantalum
Zasluge za slike: Images-of-elements
Tantalum pieces
CAS Number
7440-25-7
PubChem CID Number
23956
Atomic Properties
Atomski polmer
146 pm
Kovalentni polmer
170 pm
Elektronegativnost
1,5 (Paulingova lestvica)
Ionization Potential
7,5496 eV
Atomic Volume
10,90 cm3/mol
Toplotna prevodnost
0,575 W/cm·K
Oksidacijska stanja
-1, 2, 3, 4, 5
Applications
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.
Tantalum is considered to be non-toxic
Isotopes
Stable Isotopes
181Ta
Unstable Isotopes
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