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.
Quick facts Pípè, Ìhànsójú ...
Niobium, 41Nb |
| Niobium |
|---|
| Pípè | /naɪˈoʊbiəm/ (ny-OH-bee-əm) |
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| Ìhànsójú | gray metallic, yellowish when oxidized |
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| Ìwúwo átọ̀mù Ar, std(Nb) | 92.90637(1)[1] |
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| Niobium ní orí tábìlì àyè |
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|
|
| Nọ́mbà átọ̀mù (Z) | 41 |
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| Ẹgbẹ́ | group 5 |
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| Àyè | àyè 5 |
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| Àdìpọ̀ | Àdìpọ̀-d |
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| Ẹ̀ka ẹ́límẹ́ntì | Transition metal |
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| Ìtò ẹ̀lẹ́ktrọ́nù | [Kr] 4d4 5s1 |
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| Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 18, 12, 1 |
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| Àwọn ohun ìní ara |
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| Ìfarahàn at STP | solid |
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| Ìgbà ìyọ́ | 2750 K (2477 °C, 4491 °F) |
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| Ígbà ìhó | 5017 K (4744 °C, 8571 °F) |
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| Kíki (near r.t.) | 8.57 g/cm3 |
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| Heat of fusion | 30 kJ/mol |
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| Heat of | 689.9 kJ/mol |
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| Molar heat capacity | 24.60 J/(mol·K) |
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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 |
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| Electronegativity | Pauling scale: 1.6 |
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| Atomic radius | empirical: 146 pm |
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| Covalent radius | 164±6 pm |
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 Color lines in a spectral rangeSpectral lines of niobium |
| Other properties |
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| Natural occurrence | primordial |
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| Crystal structure | (bcc) |
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| Speed of sound thin rod | 3480 m/s (at 20 °C) |
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| Thermal expansion | 7.3 µm/(m·K) |
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| Thermal conductivity | 53.7 W/(m·K) |
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| Electrical resistivity | 152 n Ω·m (at 0 °C) |
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| Magnetic ordering | paramagnetic |
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| Young's modulus | 105 GPa |
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| Shear modulus | 38 GPa |
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| Bulk modulus | 170 GPa |
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| Poisson ratio | 0.40 |
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| Mohs hardness | 6.0 |
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| Vickers hardness | 1320 MPa |
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| Brinell hardness | 736 MPa |
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| CAS Number | 7440-03-1 |
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| Main isotopes of niobium |
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| 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 |
|
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| references |
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