Niobium
41Nb
V ↑ Nb ↓ Ta Periodic table zirconium ← niobium → molybdenum
Panagway
gray metallic, bluish when oxidized
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan	niobium, Nb, 41
Paglitok	/naɪˈoʊbiəm/ [[Help:Pronunciation respelling key|ny-Plantilya:Smallcaps all-bee-əm]]; /kəˈlʌmbiəm/ [[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
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 91Nb syn 6.8×102 y ε - 91Zr 91mNb syn 60.86 d IT 0.104e 91Nb 92Nb syn 10.15 d ε - 92Zr γ 0.934 - 92Nb syn 3.47×107y ε - 92Zr γ 0.561, 0.934 - 93Nb 100% 93Nb is stable with 52 neutrons 93mNb syn 16.13 y IT 0.031e 93Nb 94Nb syn 2.03×104 y β− 0.471 94Mo γ 0.702, 0.871 - 95Nb syn 34.991 d β− 0.159 95Mo γ 0.765 - 95mNb syn 3.61 d IT 0.235 95Nb
v t e · r

Ang niyobyo (Iningles niobium) usa ka elementong kimiko sa talaang peryodiko nga may simbolo nga Nb ug atomikong numero nga 41. Ang niyobyo mao ang puthaw nga transisyon.