Niyobyo

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 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 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

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.

Galeriya sa hulagway

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