Àdàkọ:Infobox niobium

Niobium, ₄₁Nb

Niobium
Pípè	/naɪˈoʊbiəm/ ​(ny-OH-bee-əm)
Ìhànsójú	gray metallic, yellowish when oxidized
Ìwúwo átọ̀mù Ar, std(Nb)	92.90637(1)
Niobium ní orí tábìlì àyè
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson V ↑ Nb ↓ Ta zirconium ← niobium → molybdenum
Nọ́mbà átọ̀mù (Z)	41
Ẹgbẹ́	group 5
Àyè	àyè 5
Àdìpọ̀	Àdìpọ̀-d
Ẹ̀ka ẹ́límẹ́ntì	Transition metal
Ìtò ẹ̀lẹ́ktrọ́nù	[Kr] 4d4 5s1
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 12, 1
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	2750 K ​(2477 °C, ​4491 °F)
Ígbà ìhó	5017 K ​(4744 °C, ​8571 °F)
Kíki (near r.t.)	8.57 g/cm3
Heat of fusion	30 kJ/mol
Heat of	689.9 kJ/mol
Molar heat capacity	24.60 J/(mol·K)
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	−3, −1, +1, +2, +3, +4, +5 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 1.6
Atomic radius	empirical: 146 pm
Covalent radius	164±6 pm
Color lines in a spectral range Spectral lines of niobium
Other properties
Natural occurrence	primordial
Crystal structure	​(bcc)
Speed of sound thin rod	3480 m/s (at 20 °C)
Thermal expansion	7.3 µm/(m·K)
Thermal conductivity	53.7 W/(m·K)
Electrical resistivity	152 n Ω·m (at 0 °C)
Magnetic ordering	paramagnetic
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 Number	7440-03-1
Main isotopes of niobium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 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

References

This reference list does not appear in the article.