Periodic table of the elements
ZirconiumNiobiumMolybdenum
41
Nb
Niobium
92.90638
2
8
18
12
1
41
Nb
Niobium
92.90638
2
8
18
12
1
General
NameNiobium
SymbolNb
Number41
Chemical seriesTransition elements
Group / Period5 / 5
Blockd-block
CAS registry number7440-03-1

Physical properties
Statesolid
Density8.57 g/cm3
Melting point2750 K (2477°C, 4491°F)
Boiling point5017 K (4744 °C, 8571 °F)
Critical point

Atomic properties
Atomic Weight92.90638 g/mol
Crystal structurecubic body centered
Electronegativity1.60
Atomic radius145 pm
Atomic radius (calculated)198 pm
Electron configuration[Kr] 4d4 5s1
Electrons per shell2, 8, 18, 12, 1
Number of protons41
Number of neutrons52

Other languages
SpanishNiobi
PortugueseNióbio
FrenchNiobium
GermanNiob
ItalianNiobio
RussianНиобий
PolishNiob
Chinese
Arabicنيوبيوم
TurkishNiobyum
DutchNiobium


Periodic table of the elements
ZirconiumNiobiumMolybdenum