# Strontium

Strontium,  38Sr|  |
| Ki-pún sèng-chit |
| Miâ, hû-hō | strontium, Sr |
| Gōa-hêng | silvery white metallic; with a pale yellow tint |
| Strontium tī chiu-kî-piáu lāi ê ūi-tì |
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 | Ca ↑ **Sr** ↓ Ba |
| rubidium ← **strontium** → yttrium |

 |

 |
| Goân-chú-hoan | 38 |
| Goân-chú-liōng (±) | 87.62(1)  |
| Goân-sò͘ lūi-pia̍t |   kiⁿ-thó͘ kim-sio̍k |
| Cho̍k, hun-khu | 2 cho̍k, s khu  |
| Chiu-kî | tē 5 chiu-kî  |
| Tiān-chú pâi-lia̍t | [Kr] 5s2  |
| per shell | 2, 8, 18, 8, 2 |
| Bu̍t-lí sèng-chit |
| Siòng | kò͘-thé |
| Iûⁿ-tiám | 1050 K ​(777 °C, ​1431 °F)  |
| Hut-tiám | 1650 K ​(1377 °C, ​2511 °F)  |
| Bi̍t-tō͘  (sek-un) | 2.64 g·cm−3 |
| 2.375 g·cm−3  |
| Iûⁿ-hoà-jia̍t | 7.43 kJ·mol−1  |
| Cheng-hoat-jia̍t | 141 kJ·mol−1  |
| Jia̍t-iông-liōng | 26.4 J·mol−1·K−1  |
| **cheng-khì-ap**

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

 |
| Goân-chú sèng-chit |
| Sng-hòa-sò͘ | **2**, 1 ​(a strongly basic oxide) |
| Tiān-hū-tō͘ | Pauling scale: 0.95  |
| Tiān-lī-lêng | 1st: 549.5 kJ·mol−1  2nd: 1064.2 kJ·mol−1  3rd: 4138 kJ·mol−1   |
| Goân-chú pòaⁿ-kèng | empirical: 215 pm  |
| Kiōng-kè pòaⁿ-kèng | 195±10 pm  |
| Van der Waals pòaⁿ-kèng | 249 pm  |
| Cha̍p-lio̍k |
| Chiⁿ-thé kò͘-chō |  ​face-centered cubic (fcc) |
| Jia̍t-phòng-tiòng | 22.5 µm·m−1·K−1 (at 25 °C)  |
| Jia̍t-thoân-tō-lu̍t | 35.4 W·m−1·K−1  |
| Tiān-chó͘-lu̍t | 132 nΩ·m (at 20 °C)  |
| Chû-sèng | paramagnetic  |
| Young hē-sò͘ | 15.7 GPa  |
| Shear hē-sò͘ | 6.03 GPa  |
| Poisson pí | 0.28  |
| Mohs ngē-tō͘ | 1.5  |
| CAS teng-kì pian-hō | 7440-24-6  |
| Le̍k-sú |
| Hō-miâ | after the mineral strontianite, itself named after Strontian, Scotland |
| Hoat-hiān | William Cruickshank (1787) |
| Siōng chá hû-lî | Humphry Davy (1808) |
| Chòe ún-tēng ê tông-ūi-sò͘ |
| Chú bûn-chiong: strontium ê tông-ūi-sò͘ |
|

| iso | NA | half-life | DM | DE (MeV) | DP |
| --- | --- | --- | --- | --- | --- |
| 82Sr | syn | 25.36 d | ε | – | 82Rb |
| 83Sr | syn | 1.35 d | ε | – | 83Rb |
| β+ | 1.23 | 83Rb |
| γ | 0.76, 0.36 | – |
| 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** sī 1 ê hoà-ha̍k goân-sò͘. I ê goân-chú-hoan sī 38, hoà-ha̍k hû-hō sī Sr.

## Chham-khó