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Plantilya:Infobox niobium .
Niobium
41 Nb
Panagway
gray metallic, bluish when oxidized
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan
niobium, Nb, 41
Paglitok
[[Help:Pronunciation respelling key|ny-Plantilya:Smallcaps all -bee-əm ]] ; [[Help:Pronunciation respelling key|kə-Plantilya:Smallcaps all -bee-əm ]]
Kategoriyang elemento
puthaw nga transisyon
Group, period, block
5, 5, d
Gibug-aton sa atomo
92.90638
Kontorno sa elektron
[Kr ] 4d4 5s1 2, 8, 18, 12, 1
Electron shells of niobium (2, 8, 18, 12, 1)
History
Pagkadiskobre
Charles Hatchett (1801)
First isolation
Christian Wilhelm Blomstrand (1864)
Recognized as a distinct element by
Heinrich Rose (1844)
Physical properties
Phase
magahi
Density (near r.t.)
8.57 g·cm−3
Melting point
2750 K , 2477 °C, 4491 °F
Boiling point
5017 K, 4744 °C, 8571 °F
Heat of fusion
30 kJ·mol−1
Heat of vaporization
689.9 kJ·mol−1
Molar heat capacity
24.60 J·mol−1 ·K−1
Vapor pressure
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
2942
3207
3524
3910
4393
5013
Atomic properties
Oxidation states
5 , 4, 3, 2, -1 (mildly acidic oxide)
Electronegativity
1.6 (Pauling scale)
Ionization energies
1st: 652.1 kJ·mol−1
2nd: 1380 kJ·mol−1
3rd: 2416 kJ·mol−1
Atomic radius
146 pm
Covalent radius
164±6 pm
Miscellanea
Crystal structure
cubic body-centered
Magnetic ordering
paramagnetic
Electrical resistivity
(0 °C) 152 nΩ·m
Thermal conductivity
53.7 W·m−1 ·K−1
Thermal expansion
7.3 µm/(m·K)
Speed of sound (thin rod)
(20 °C) 3480 m·s−1
Young's modulus
105 GPa
Shear modulus
38 GPa
Bulk modulus
170 GPa
Poisson ratio
0.40
Mohs hardness
6.0
Vickers hardness
1320 MPa
Brinell hardness
736 MPa
CAS registry number
7440-03-1
Most stable isotopes
Main article: Isotopes of niobium
iso
NA
half-life
DM
DE (MeV)
DP
91 Nb
syn
6.8×102 y
ε
-
91 Zr
91m Nb
syn
60.86 d
IT
0.104e
91 Nb
92 Nb
syn
10.15 d
ε
-
92 Zr
γ
0.934
-
92 Nb
syn
3.47×107 y
ε
-
92 Zr
γ
0.561, 0.934
-
93 Nb
100%
93 Nb is stable with 52 neutrons
93m Nb
syn
16.13 y
IT
0.031e
93 Nb
94 Nb
syn
2.03×104 y
β−
0.471
94 Mo
γ
0.702, 0.871
-
95 Nb
syn
34.991 d
β−
0.159
95 Mo
γ
0.765
-
95m Nb
syn
3.61 d
IT
0.235
95 Nb
· r
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