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

Strontium,  38Sr| ngoi-kôn |
| --- |
|
silvery white metallic; with a pale yellow tint  |
| Kî-pún sin-sit |
| Miàng, fù-ho |
Strontium, Sr |
| ngoi-hìn |
silvery white metallic; with a pale yellow tint |
| Strontium chhai chû-khì-péu ke vi-chi |
|

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 | Ca ↑ **Sr** ↓ Ba |
| rubidium ← **Strontium** → yttrium |

 |

 |
| ngièn-chṳ́ sì-sú |
38 |
| ngièn-chṳ́-liòng (±) |
87.62(1)  |
| ngièn-su lui-phe̍t |   kán-thú kîm-su̍k |
| Chhu̍k, fûn-khî | 2 chhu̍k, s-block  |
| chû-khì |
period 5  |
| thien-chṳ́ phài-lie̍t | [Kr] 5s2  |
| per shell |
2, 8, 18, 8, 2 |
| vu̍t-lî sin-chṳt |
| Siông |
ku-thí |
| yùng-tiám |
1050 K ​(777 °C, ​1431 °F)  |
| pui-tiám |
1650 K ​(1377 °C, ​2511 °F)  |
| Me̍t-thu near Sit-vûn |
2.64 g·cm−3 |
|
2.375 g·cm−3  |
| Yùng-fa-ngie̍t |
7.43 kJ·mol−1  |
| Chîn-fat-ngie̍t |
141 kJ·mol−1  |
| Ngie̍t-yùng-liong |
26.4 J·mol−1·K−1  |
| **chîn-hi-ap**

|  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- |
| P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
| chhai T (K) | 796 | 882 | 990 | 1139 | 1345 | 1646 |

 |
| Ngièn-chṳ́ sin-chṳt |
| Yông-fa-su | **2**, 1 ​(a strongly basic oxide) |
| Thien-fu-sin |
Pauling scale: 0.95  |
| Thien-lì-nèn |
1st: 549.5 kJ·mol−1  2nd: 1064.2 kJ·mol−1  3rd: 4138 kJ·mol−1   |
| Ngièn-chṳ́ pan-kang |
empirical: 215 pm  |
| Khiung-ka pan-kang |
195±10 pm  |
| Van der Waals pan-kang |
249 pm  |
| Miscellanea |
| Chîn-thí keu-chho |  ​face-centered cubic (fcc) |
| Ngie̍t-phàng-chong |
22.5 µm·m−1·K−1 (at 25 °C)  |
| Ngie̍t-chhòn-thô-li̍t |
35.4 W·m−1·K−1  |
| Thien-chú-li̍t |
132 nΩ·m (at 20 °C)  |
| Chhṳ̀-sin |
paramagnetic  |
| Young's modulus |
15.7 GPa  |
| Shear modulus |
6.03 GPa  |
| Poisson ratio |
0.28  |
| Mohs hardness |
1.5  |
| CAS Registry Number |
7440-24-6  |
| Le̍k-sú |
| Hí-miàng |
after the mineral strontianite, itself named after Strontian, Scotland |
| Fat-hien |
William Cruickshank (1787) |
| First isolation |
Humphry Davy (1808) |
| Chui vún-thin ke thùng-vi-su |
|
Chú vùn-chông: Strontium ke thùng-vi-su |
|

| iso | NA | half-life | DM | DE (MeV) | DP |
| --- | --- | --- | --- | --- | --- |
| 82Sr | syn | 25.36 d | ε | – | 82Rb |
| 83Sr | syn | 1.35 d | ε | 83Rb |
| β+ | 83Rb |
| γ | – |
| 84Sr | 0.56% | – | (β+β+) | 1.7867 | 84Kr |
| 85Sr | syn | 64.84 d | ε | – | 85Rb |
| γ | 0.514D | – |
| 86Sr | 9.86% | 86Sr is stable with 48 neutrons |
| 87Sr | 7.0% | 87Sr is stable with 49 neutrons |
| 88Sr | 82.58% | 88Sr is stable with 50 neutrons |
| 89Sr | syn | 50.52 d | ε | 1.49 | 89Rb |
| β− | 0.909D | 89Y |
| 90Sr | trace | 28.90 y | β− | 0.546 | 90Y |

 |
|
Decay modes in parentheses are predicted, but have not yet been observed |

**Strontium** (Hon-ngî: 鍶 *sī*) he yit-chúng fa-ho̍k ngièn-su, fa-ho̍k fù-ho vì **Sr**, ngièn-chṳ́ su-muk he **38**.

## Chhâm-kháu chṳ̂-liau