# Uranium[phiên-siá | kói ngièn-sṳ́-mâ]

Uranium,  92U| ngoi-kôn |
| --- |
|
silvery gray metallic; corrodes to a spalling black oxide coat in air  |
| Kî-pún sin-sit |
| Miàng, fù-ho |
Uranium, U |
| ngoi-hìn |
silvery gray metallic; corrodes to a spalling black oxide coat in air |
| Uranium chhai chû-khì-péu ke vi-chi |
|

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 | Nd ↑ **U** ↓ (Uqq) |
| protactinium ← **Uranium** → neptunium |

 |

 |
| ngièn-chṳ́ sì-sú |
92 |
| ngièn-chṳ́-liòng (±) |
238.02891(3)  |
| ngièn-su lui-phe̍t |   actinium-hi |
| Chhu̍k, fûn-khî | n/a, f-block  |
| chû-khì |
period 7  |
| thien-chṳ́ phài-lie̍t | [Rn] 5f3 6d1 7s2  |
| per shell |
2, 8, 18, 32, 21, 9, 2 |
| vu̍t-lî sin-chṳt |
| Siông |
ku-thí |
| yùng-tiám |
1405.3 K ​(1132.2 °C, ​2070 °F)  |
| pui-tiám |
4404 K ​(4131 °C, ​7468 °F)  |
| Me̍t-thu near Sit-vûn |
19.1 g·cm−3 |
|
17.3 g·cm−3  |
| Yùng-fa-ngie̍t |
9.14 kJ·mol−1  |
| Chîn-fat-ngie̍t |
417.1 kJ·mol−1  |
| Ngie̍t-yùng-liong |
27.665 J·mol−1·K−1  |
| **chîn-hi-ap**

|  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- |
| P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
| chhai T (K) | 2325 | 2564 | 2859 | 3234 | 3727 | 4402 |

 |
| Ngièn-chṳ́ sin-chṳt |
| Yông-fa-su | **6**, 5, 4, 3, 2, 1 ​(a weakly basic oxide) |
| Thien-fu-sin |
Pauling scale: 1.38  |
| Thien-lì-nèn |
1st: 597.6 kJ·mol−1  2nd: 1420 kJ·mol−1   |
| Ngièn-chṳ́ pan-kang |
empirical: 156 pm  |
| Khiung-ka pan-kang |
196±7 pm  |
| Van der Waals pan-kang |
186 pm  |
| Miscellanea |
| Chîn-thí keu-chho |  ​orthorhombic |
| Sâng-suk  thin rod |
3155 m·s−1 (at 20 °C)  |
| Ngie̍t-phàng-chong |
13.9 µm·m−1·K−1 (at 25 °C)  |
| Ngie̍t-chhòn-thô-li̍t |
27.5 W·m−1·K−1  |
| Thien-chú-li̍t |
0.280 µΩ·m (at 0 °C)  |
| Chhṳ̀-sin |
paramagnetic  |
| Young's modulus |
208 GPa  |
| Shear modulus |
111 GPa  |
| Bulk modulus |
100 GPa  |
| Poisson ratio |
0.23  |
| Vickers hardness |
1960–2500 MPa  |
| Brinell hardness |
2350–3850 MPa  |
| CAS Registry Number |
7440-61-1  |
| Le̍k-sú |
| Hí-miàng |
after planet Uranus, itself named after Greek god of the sky Uranus |
| Fat-hien |
Martin Heinrich Klaproth (1789) |
| First isolation |
Eugène-Melchior Péligot (1841) |
| Chui vún-thin ke thùng-vi-su |
|
Chú vùn-chông: Uranium ke thùng-vi-su |
|

| iso | NA | half-life | DM | DE (MeV) | DP |
| --- | --- | --- | --- | --- | --- |
| 232U | syn | 68.9 y | SF | – | – |
| α | 5.414 | 228Th |
| 233U | trace | 1.592×105 y | SF | 197.93 | – |
| α | 4.909 | 229Th |
| 234U | 0.005% | 2.455×105 y | SF | 197.78 | – |
| α | 4.859 | 230Th |
| 235U | 0.720% | 7.04×108 y | SF | 202.48 | – |
| α | 4.679 | 231Th |
| 236U | trace | 2.342×107 y | SF | 201.82 | – |
| α | 4.572 | 232Th |
| 238U | 99.274% | 4.468×109 y | α | 234Th |
| SF | – |
| β−β− | 238Pu |

 |

**Uranium** (Hon-ngî: 鈾 *yóu*) he yit-chúng fa-ho̍k ngièn-su, fa-ho̍k fù-ho vì **U**, ngièn-chṳ́ su-muk he **92**.

## Chhâm-kháu chṳ̂-liau