# Phêng-sò͘

Phêng-sò͘,  5B| boron (β-rhombohedral) |
| Ki-pún sèng-chit |
| Miâ, hû-hō | Phêng-sò͘, B |
| Eng-bûn | boron |
| Phian-miâ | pâng-sò͘ |
| Tông-sò͘-thé | α-, β-rhombohedral, β-tetragonal (and more) |
| Gōa-hêng | black-brown |
| Phêng-sò͘ tī chiu-kî-piáu lāi ê ūi-tì |
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 | – ↑ **B** ↓ Al |
| beryllium ← **Phêng-sò͘** → thoàⁿ-sò͘ |

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 |
| Goân-chú-hoan | 5 |
| Goân-chú-liōng | 10.81 (10.806–10.821) |
| Goân-sò͘ lūi-pia̍t |   lūi-kim-sio̍k |
| Cho̍k, hun-khu | 13 cho̍k, p khu  |
| Chiu-kî | tē 2 chiu-kî  |
| Tiān-chú pâi-lia̍t | [He] 2s2 2p1  |
| per shell | 2, 3 |
| Bu̍t-lí sèng-chit |
| Siòng | kò͘-thé |
| Iûⁿ-tiám | 2349 K ​(2076 °C, ​3769 °F)  |
| Hut-tiám | 4200 K ​(3927 °C, ​7101 °F)  |
| iông-tiám ê e̍k-thé bi̍t-tō͘ | 2.08 g·cm−3  |
| Iûⁿ-hoà-jia̍t | 50.2 kJ·mol−1  |
| Cheng-hoat-jia̍t | 508 kJ·mol−1  |
| Jia̍t-iông-liōng | 11.087 J·mol−1·K−1  |
| **cheng-khì-ap**

|  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- |
| P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
| tī T (K) | 2348 | 2562 | 2822 | 3141 | 3545 | 4072 |

 |
| Goân-chú sèng-chit |
| Sng-hòa-sò͘ | **3**, 2, 1, −1, −5 ​(a mildly acidic oxide) |
| Tiān-hū-tō͘ | Pauling scale: 2.04  |
| Tiān-lī-lêng | 1st: 800.6 kJ·mol−1  2nd: 2427.1 kJ·mol−1  3rd: 3659.7 kJ·mol−1  (more)  |
| Goân-chú pòaⁿ-kèng | empirical: 90 pm  |
| Kiōng-kè pòaⁿ-kèng | 84±3 pm  |
| Van der Waals pòaⁿ-kèng | 192 pm  |
| Cha̍p-lio̍k |
| Chiⁿ-thé kò͘-chō |  ​rhombohedral |
| Siaⁿ-sok  (sòe kùn-á) | 16,200 m·s−1 (at 20 °C)  |
| Jia̍t-phòng-tiòng | β form: 5–7 µm·m−1·K−1 (at 25 °C)  |
| Jia̍t-thoân-tō-lu̍t | 27.4 W·m−1·K−1  |
| Tiān-chó͘-lu̍t | ~106 Ω·m (at 20 °C)  |
| Chû-sèng | diamagnetic  |
| Mohs ngē-tō͘ | ~9.5  |
| CAS teng-kì pian-hō | 7440-42-8  |
| Le̍k-sú |
| Hoat-hiān | Joseph Louis Gay-Lussac and Louis Jacques Thénard (30 June 1808) |
| Siōng chá hû-lî | Humphry Davy (9 July 1808) |
| Chòe ún-tēng ê tông-ūi-sò͘ |
| Chú bûn-chiong: Phêng-sò͘ ê tông-ūi-sò͘ |
|

| iso | NA | half-life | DM | DE (MeV) | DP |
| --- | --- | --- | --- | --- | --- |
| 10B | 19.9(7)% | 10B is stable with 5 neutrons |
| 11B | 80.1(7)% | 11B is stable with 6 neutrons |

 |
| 10B content may be as low as 19.1% and as high as 20.3% in natural samples. 11B is the remainder in such cases. |

**Phêng-sò͘** (Pâng-, 硼素) sī kì-hō **B** (Eng-gí: *boron*) ê goân-sò͘, goân-chú-hoan 5, goân-chú-liōng 10.81. I ū kim-sio̍k kap hui-kim-sio̍k chi kan ê sèng-chit.

## Chham-khó