| Niobium |
|
41Nb
|
|
|
| Ìhànsójú |
gray metallic, yellowish when oxidized
 |
| Àwọn ìdámọ́ wíwọ́pọ̀ |
| Orúkọ, àmì-ìdámọ́, nọ́mbà |
niobium, Nb, 41 |
| Ẹ̀ka ẹ́límẹ̀nti |
transition metal |
| Ẹgbẹ́, àsìkò, àdìpò |
5, 5, d |
| Ìwúwo átọ́mù |
92.90638 |
| Ìtòléra ẹ̀lẹ́ktrónì |
[Kr] 4d4 5s1
2, 8, 18, 12, 1 |
| Physical properties |
| Phase |
solid |
| 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 |
| Àwọn ísótòpù dídúró jùlọ |
| Main article: Àwọn ísótòpù niobium |
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· r |
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.
