Niob
41
Nb
Gruppe
5
Periode
5
Blokk
d
Protoner
Elektroner
Nøytroner
41
41
52
Generelle egenskaper
Atomnummer
41
Atomvekt
92,90638
Massetall
93
Kategori
Transisjonsmetaller
Farge
Grå
Radioaktiv
Nei
Named after Niobe, the daughter of Tantalu
Krystallstruktur
Body Centered Cubic
Historie
Niobium was discovered by the English chemist Charles Hatchett in 1801 and named the new element columbium.
In 1846, German chemist Henrich Rose independently discovered the element and named it niobium.
The metal was first isolated by Swedish scientist Christian Wilhelm Blomstrand in 1864 who reduced the chloride by heating it in a hydrogen atmosphere.
In 1846, German chemist Henrich Rose independently discovered the element and named it niobium.
The metal was first isolated by Swedish scientist Christian Wilhelm Blomstrand in 1864 who reduced the chloride by heating it in a hydrogen atmosphere.
Elektroner per energinivå
2, 8, 18, 12, 1
Elektronkonfigurasjon
[Kr] 4d4 5s1
Brazil is the leading producer of niobium
Fysikalske egenskaper
Fase
Fast stoff
Tetthet
8,57 g/cm3
Smeltepunkt
2750,15 K | 2477 °C | 4490,6 °F
Kokepunkt
5017,15 K | 4744 °C | 8571,2 °F
Smeltevarme
26,8 kJ/mol
Fordampningsvarme
690 kJ/mol
Spesifikk varmekapasitet
0,265 J/g·K
Forekomst i jordskorpa
0,0017%
Forekomst i universet
2×10-7%
CAS Number
7440-03-1
PubChem CID Number
23936
Atomegenskaper
Atomradius
146 pm
Kovalent radius
164 pm
Elektronegativitet
1,6 (Pauling-skalaen)
Ioniseringsenergi
6,7589 eV
Molart volum
10,87 cm3/mol
Termisk ledningsevne
0,537 W/cm·K
Oksidasjonstilstander
-1, 2, 3, 4, 5
Bruksområder
Niobium is used in arc-welding rods for stabilized grades of stainless steel.
Niobium alloys are strong and are often used in pipeline construction.
The metal is used in superalloys for jet engines and heat resistant equipment.
Niobium is found in many medical devices such as pacemakers.
Niobium alloys are strong and are often used in pipeline construction.
The metal is used in superalloys for jet engines and heat resistant equipment.
Niobium is found in many medical devices such as pacemakers.
Some niobium compounds are highly toxic
Isotoper
Stabile isotoper
93NbUstabile isotoper
81Nb, 82Nb, 83Nb, 84Nb, 85Nb, 86Nb, 87Nb, 88Nb, 89Nb, 90Nb, 91Nb, 92Nb, 94Nb, 95Nb, 96Nb, 97Nb, 98Nb, 99Nb, 100Nb, 101Nb, 102Nb, 103Nb, 104Nb, 105Nb, 106Nb, 107Nb, 108Nb, 109Nb, 110Nb, 111Nb, 112Nb, 113Nb