Tantaal

73
Ta
Groep
5
Periode
6
Blok
d
Protonen
Elektronen
Neutronen
73
73
108
Algemene Eigenschappen
Atoomnummer
73
Atomair gewicht
180,94788
Massa Getal
181
Categorie
Overgangsmetalen
Kleur
Grijs
Radioactief
Nee
Named after Tantalos, a Greek mythological character, father of Niobe
Kristalstructuur
Ruimtelijk-gecentreerde Kubus
Historie
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.
Eletronen per schil
2, 8, 18, 32, 11, 2
Electronconfiguratie
[Xe] 4f14 5d3 6s2
Ta
Tantalum occurs principally in the mineral columbite-tantalite
Fysieke Eigenschappen
Fase
Vast
Dichtheid
16,654 g/cm3
Smeltpunt
3290,15 K | 3017 °C | 5462,6 °F
Kookpunt
5731,15 K | 5458 °C | 9856,4 °F
Fusiewarmte
36 kJ/mol
Verdampingswarmte
735 kJ/mol
Specifieke Warmtecapaciteit
0,14 J/g·K
Overvloedig aanwezig in de aardkorst
0,00017%
Overvloedig aanwezig in het universum
8×10-9%
Tantalum
Verdiensten voor afbeeldingen: Images-of-elements
Tantalum pieces
CAS-nummer
7440-25-7
PubChem CID nummer
23956
Atoomeigenschappen
Atoomstraal
146 pm
Covalentiestraal
170 pm
Electronegativiteit
1,5 (Pauling schaal)
Ionisatiepotentiaal
7,5496 eV
Atoomvolume
10,90 cm3/mol
Thermische geleiding
0,575 W/cm·K
Oxidatietoestanden
-1, 2, 3, 4, 5
Toepassingen
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
Isotopen
Stabiele isotopen
181Ta
Instabiele isotopen
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