Niobium (pípè /naɪˈoʊbiəm/ nye-OH -bee-əm ) (Greek mythology : Niobe , omo birin Tantalus ), tabi columbium (/kəˈlʌmbiəm/ kə-LUM -bee-əm ), je ipilese elegbogi pelu ami-idamo Nb ati nomba atomu 41.
Niobium, 41 Nb Niobium Pípè / n aɪ ˈ oʊ b i ə m / (ny-OH -bee-əm ) Ìhànsójú gray metallic, yellowish when oxidized Ìwúwo átọ̀mù A r, std (Nb) 92.9063 7(1) [ 1] Niobium ní orí tábìlì àyè
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 niobiumOther 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
Àdàkọ:Category-inline | references
↑ Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; De Bièvre, Paul; Gröning, Manfred; Holden, Norman E.; Irrgeher, Johanna et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry 88 (3): 265–91. doi :10.1515/pac-2015-0305 .