# Rubidium

Rubidium,  37Rb|  |
| Ki-pún sèng-chit |
| Miâ, hû-hō | rubidium, Rb |
| Gōa-hêng | grey white |
| Rubidium tī chiu-kî-piáu lāi ê ūi-tì |
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 | K ↑ **Rb** ↓ Cs |
| krypton ← **rubidium** → strontium |

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 |
| Goân-chú-hoan | 37 |
| Goân-chú-liōng (±) | 85.4678(3)  |
| Goân-sò͘ lūi-pia̍t |   kiⁿ-kim-sio̍k |
| Cho̍k, hun-khu | 1 cho̍k, s khu  |
| Chiu-kî | tē 5 chiu-kî  |
| Tiān-chú pâi-lia̍t | [Kr] 5s1  |
| per shell | 2, 8, 18, 8, 1 |
| Bu̍t-lí sèng-chit |
| Siòng | kò͘-thé |
| Iûⁿ-tiám | 312.45 K ​(39.30 °C, ​102.74 °F)  |
| Hut-tiám | 961 K ​(688 °C, ​1270 °F)  |
| Bi̍t-tō͘  (sek-un) | 1.532 g·cm−3 |
| 1.46 g·cm−3  |
| Sam-siòng-tiám | 312.41 K, ​? kPa  |
| Lîm-kài-tiám | 2093 K, 16 MPa *(extrapolated)* |
| Iûⁿ-hoà-jia̍t | 2.19 kJ·mol−1  |
| Cheng-hoat-jia̍t | 69 kJ·mol−1  |
| Jia̍t-iông-liōng | 31.060 J·mol−1·K−1  |
| **cheng-khì-ap**

|  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- |
| P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
| tī T (K) | 434 | 486 | 552 | 641 | 769 | 958 |

 |
| Goân-chú sèng-chit |
| Sng-hòa-sò͘ | **+1**, −1 ​(a strongly basic oxide) |
| Tiān-hū-tō͘ | Pauling scale: 0.82  |
| Tiān-lī-lêng | 1st: 403 kJ·mol−1  2nd: 2632.1 kJ·mol−1  3rd: 3859.4 kJ·mol−1   |
| Goân-chú pòaⁿ-kèng | empirical: 248 pm  |
| Kiōng-kè pòaⁿ-kèng | 220±9 pm  |
| Van der Waals pòaⁿ-kèng | 303 pm  |
| Cha̍p-lio̍k |
| Chiⁿ-thé kò͘-chō |  ​body-centered cubic (bcc) |
| Siaⁿ-sok  (sòe kùn-á) | 1300 m·s−1 (at 20 °C)  |
| Jia̍t-phòng-tiòng | 90 µm·m−1·K−1 (at r.t.) |
| Jia̍t-thoân-tō-lu̍t | 58.2 W·m−1·K−1  |
| Tiān-chó͘-lu̍t | 128 nΩ·m (at 20 °C)  |
| Chû-sèng | paramagnetic  |
| Young hē-sò͘ | 2.4 GPa  |
| Bulk hē-sò͘ | 2.5 GPa  |
| Mohs ngē-tō͘ | 0.3  |
| Brinell ngē-tō͘ | 0.216 MPa  |
| CAS teng-kì pian-hō | 7440-17-7  |
| Le̍k-sú |
| Hoat-hiān | Robert Bunsen and Gustav Kirchhoff (1861) |
| Siōng chá hû-lî | George de Hevesy |
| Chòe ún-tēng ê tông-ūi-sò͘ |
| Chú bûn-chiong: rubidium ê tông-ūi-sò͘ |
|

| iso | NA | half-life | DM | DE (MeV) | DP |
| --- | --- | --- | --- | --- | --- |
| 83Rb | syn | 86.2 d | ε | – | 83Kr |
| γ | 0.52, 0.53, 0.55 | –
Pang-bô͘:Infobox element/isotopes decay4 |
| 85Rb | 72.17% | 85Rb is stable with 48 neutrons |
| 86Rb | syn | 18.65 d | β− | 1.775 | 86Sr |
| γ | 1.0767 | – |
| 87Rb | 27.83% | 4.9×1010 y | β− | 0.283 | 87Sr |

 |

**Rubidium** sī 1 ê hoà-ha̍k goân-sò͘. I ê goân-chú-hoan sī 37, hoà-ha̍k hû-hō sī Rb.

## Chham-khó