Niobium
41
Nb
Gruppe
5
Periode
5
Blok
d
Protoner
Elektroner
Neutroner
41
41
52
Generelle Egenskaber
Atomnummer
41
Atommasse
92,90638
Masseantal
93
Kategori
Overgangsmetaller
Farve
Grå
Radioaktiv
Nej
Named after Niobe, the daughter of Tantalu
Krystalstruktur
Rumcentreret Kubisk
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 i hver skal
2, 8, 18, 12, 1
Elektronkonfiguration
[Kr] 4d4 5s1
Brazil is the leading producer of niobium
Fysiske Egenskaber
Tilstandsform
Fast stof
Massefylde
8,57 g/cm3
Smeltepunkt
2750,15 K | 2477 °C | 4490,6 °F
Kogepunkt
5017,15 K | 4744 °C | 8571,2 °F
Smeltevarme
26,8 kJ/mol
Fordampningsvarme
690 kJ/mol
Varmefylde
0,265 J/g·K
Forekomst i jordskorpen
0,0017%
Forekomst i universet
2×10-7%
CAS-nummer
7440-03-1
PubChem CID-nummer
23936
Atomare egenskaber
Atomradius
146 pm
Kovalent radius
164 pm
Elektronegativitet
1,6 (Paulings skala)
Ioniseringspotentiale
6,7589 eV
Atomvolumen
10,87 cm3/mol
Varmeledningsevne
0,537 W/cm·K
Oxidationstrin
-1, 2, 3, 4, 5
Anvendelser
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