Niobium, 41Nbngoi-kôn |
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gray metallic, bluish when oxidized
![A lump of gray shining crystals with hexagonal facetting](//upload.wikimedia.org/wikipedia/commons/thumb/f/f2/Niobium_crystals_and_1cm3_cube.jpg/250px-Niobium_crystals_and_1cm3_cube.jpg) |
Kî-pún sin-sit |
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Miàng, fù-ho |
Niobium, Nb |
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ngoi-hìn |
gray metallic, bluish when oxidized |
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Niobium chhai chû-khì-péu ke vi-chi |
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|
ngièn-chṳ́ sì-sú |
41 |
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ngièn-chṳ́-liòng (±) |
92.90637(2)[1] |
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ngièn-su lui-phe̍t |
ko-thu kîm-su̍k |
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Chhu̍k, fûn-khî |
5 chhu̍k, d-block |
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chû-khì |
period 5 |
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thien-chṳ́ phài-lie̍t |
[Kr] 4d4 5s1 |
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per shell |
2, 8, 18, 12, 1 |
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vu̍t-lî sin-chṳt |
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Siông |
ku-thí |
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yùng-tiám |
2750 K (2477 °C, 4491 °F) |
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pui-tiám |
5017 K (4744 °C, 8571 °F) |
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Me̍t-thu near Sit-vûn |
8.57 g·cm−3 |
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Yùng-fa-ngie̍t |
30 kJ·mol−1 |
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Chîn-fat-ngie̍t |
689.9 kJ·mol−1 |
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Ngie̍t-yùng-liong |
24.60 J·mol−1·K−1 |
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chîn-hi-ap
P (Pa)
|
1
|
10
|
100
|
1 k
|
10 k
|
100 k
|
chhai T (K)
|
2942
|
3207
|
3524
|
3910
|
4393
|
5013
| |
Ngièn-chṳ́ sin-chṳt |
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Yông-fa-su |
5, 4, 3, 2, 1, −1, −3 (a mildly acidic oxide) |
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Thien-fu-sin |
Pauling scale: 1.6 |
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Thien-lì-nèn |
1st: 652.1 kJ·mol−1 2nd: 1380 kJ·mol−1 3rd: 2416 kJ·mol−1 |
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Ngièn-chṳ́ pan-kang |
empirical: 146 pm |
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Khiung-ka pan-kang |
164±6 pm |
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Miscellanea |
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Chîn-thí keu-chho |
body-centered cubic (bcc) |
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Sâng-suk thin rod |
3480 m·s−1 (at 20 °C) |
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Ngie̍t-phàng-chong |
7.3 µm·m−1·K−1 |
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Ngie̍t-chhòn-thô-li̍t |
53.7 W·m−1·K−1 |
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Thien-chú-li̍t |
152 nΩ·m (at 0 °C) |
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Chhṳ̀-sin |
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 |
870–1320 MPa |
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Brinell hardness |
735–2450 MPa |
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CAS Registry Number |
7440-03-1 |
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Le̍k-sú |
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Hí-miàng |
after Niobe in Greek mythology, daughter of Tantalus (tantalum) |
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Fat-hien |
Charles Hatchett (1801) |
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First isolation |
Christian Wilhelm Blomstrand (1864) |
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Recognized as a distinct element by |
Heinrich Rose (1844) |
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Chui vún-thin ke thùng-vi-su |
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Chú vùn-chông: Niobium ke thùng-vi-su |
iso
|
NA
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half-life
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DM
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DE (MeV)
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DP
|
90Nb
|
syn
|
14.6 h
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β+
|
–
|
90Zr
|
91Nb
|
syn
|
680 y
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ε
|
–
|
91Zr
|
91mNb
|
syn
|
60.86 d
|
IT
|
0.104e
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91Nb
|
92m1Nb
|
syn
|
10.15 d
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ε
|
–
|
92Zr
|
γ
|
0.934
|
–
|
92Nb
|
syn
|
3.47×107 y
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ε
|
–
|
92Zr
|
γ
|
0.561, 0.934
|
–
|
93Nb
|
100%
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–
|
(SF)
|
<0.943
|
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93mNb
|
syn
|
16.13 y
|
IT
|
0.031e
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93Nb
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94Nb
|
syn
|
20300 y
|
β−
|
0.471
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94Mo
|
γ
|
0.702, 0.871
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–
|
95Nb
|
syn
|
34.991 d
|
β−
|
0.159
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95Mo
|
γ
|
0.765
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–
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95mNb
|
syn
|
3.61 d
|
IT
|
0.235
|
95Nb
|
96Nb
|
syn
|
23.4 h
|
β−
|
–
|
96Mo
| |
Decay modes in parentheses are predicted, but have not yet been observed |
Niobium (Hon-ngî: 鈮 ní) he yit-chúng fa-ho̍k ngièn-su, fa-ho̍k fù-ho vì Nb, ngièn-chṳ́ su-muk he 41.