Tantal

73
Ta
Grupp
5
Period
6
Block
d
Protoner
Electrons
Neutroner
73
73
108
Generella Egenskaper
Atomnummer
73
Atommassa
180,94788
Mass Number
181
Kategori
Övergångsmetaller
Färg
Grå
Radioaktiv
Nej
Named after Tantalos, a Greek mythological character, father of Niobe
Kristallstruktur
Rymdcentrerat kubisk
Historia
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.
Elektroner per skal
2, 8, 18, 32, 11, 2
Elektronkonfiguration
[Xe] 4f14 5d3 6s2
Ta
Tantalum occurs principally in the mineral columbite-tantalite
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
16,654 g/cm3
Smältpunkt
3290,15 K | 3017 °C | 5462,6 °F
Kokpunkt
5731,15 K | 5458 °C | 9856,4 °F
Smältvärme
36 kJ/mol
Ångbildningsvärme
735 kJ/mol
Specifik värmekapacitet
0,14 J/g·K
Abundance in Earth's crust
0,00017%
Abundance in Universe
8×10-9%
Tantalum
Bildkrediter: Images-of-elements
Tantalum pieces
CAS Number
7440-25-7
PubChem CID Number
23956
Atomära Egenskaper
Atomradie
146 pm
Kovalent radie
170 pm
Elektronegativitet
1,5 (Paulingskalan)
Jonisationspotential
7,5496 eV
Molvolym
10,90 cm3/mol
Värmeledningsförmåga
0,575 W/cm·K
Oxidationstillstånd
-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
Isotoper
Stabila isotoper
181Ta
Instabila isotoper
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