# Phìn[phiên-siá | kói ngièn-sṳ́-mâ]

Phìn,  5B| ngoi-kôn |
| --- |
|
black-brown  boron (β-rhombohedral) |
| Kî-pún sin-sit |
| Miàng, fù-ho |
Phìn, B |
| Yîn-ngî |
boron |
| thùng-su-thí |
α-, β-rhombohedral, β-tetragonal (and more) |
| ngoi-hìn |
black-brown |
| Phìn chhai chû-khì-péu ke vi-chi |
|

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|

|  |  |  |
| --- | --- | --- |
|  |  |  |
|  |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

 | – ↑ **B** ↓ Al |
| beryllium ← **Phìn** → Than |

 |

 |
| ngièn-chṳ́ sì-sú |
5 |
| ngièn-chṳ́-liòng |
10.81 (10.806–10.821) |
| ngièn-su lui-phe̍t |   lui-kîm-su̍k |
| Chhu̍k, fûn-khî | 13 chhu̍k, p-block  |
| chû-khì |
period 2  |
| thien-chṳ́ phài-lie̍t | [He] 2s2 2p1  |
| per shell |
2, 3 |
| vu̍t-lî sin-chṳt |
| Siông |
ku-thí |
| yùng-tiám |
2349 K ​(2076 °C, ​3769 °F)  |
| pui-tiám |
4200 K ​(3927 °C, ​7101 °F)  |
| yùng-tiám ke yi̍t-thí me̍t-thu |
2.08 g·cm−3  |
| Yùng-fa-ngie̍t |
50.2 kJ·mol−1  |
| Chîn-fat-ngie̍t |
508 kJ·mol−1  |
| Ngie̍t-yùng-liong |
11.087 J·mol−1·K−1  |
| **chîn-hi-ap**

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

 |
| Ngièn-chṳ́ sin-chṳt |
| Yông-fa-su | **3**, 2, 1, −1, −5 ​(a mildly acidic oxide) |
| Thien-fu-sin |
Pauling scale: 2.04  |
| Thien-lì-nèn |
1st: 800.6 kJ·mol−1  2nd: 2427.1 kJ·mol−1  3rd: 3659.7 kJ·mol−1  (more)  |
| Ngièn-chṳ́ pan-kang |
empirical: 90 pm  |
| Khiung-ka pan-kang |
84±3 pm  |
| Van der Waals pan-kang |
192 pm  |
| Miscellanea |
| Chîn-thí keu-chho |  ​rhombohedral |
| Sâng-suk  thin rod |
16,200 m·s−1 (at 20 °C)  |
| Ngie̍t-phàng-chong |
β form: 5–7 µm·m−1·K−1 (at 25 °C)  |
| Ngie̍t-chhòn-thô-li̍t |
27.4 W·m−1·K−1  |
| Thien-chú-li̍t |
~106 Ω·m (at 20 °C)  |
| Chhṳ̀-sin |
diamagnetic  |
| Mohs hardness |
~9.5  |
| CAS Registry Number |
7440-42-8  |
| Le̍k-sú |
| Fat-hien |
Joseph Louis Gay-Lussac and Louis Jacques Thénard (30 June 1808) |
| First isolation |
Humphry Davy (9 July 1808) |
| Chui vún-thin ke thùng-vi-su |
|
Chú vùn-chông: Phìn ke thùng-vi-su |
|

| 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. |

**Phìn** (硼), fe̍t-chá ham-cho **phìn-su** (硼素), he yit-chúng Fa-ho̍k ngièn-su, fa-ho̍k fù-ho vì **B**, ngièn-chṳ́ su-muk he **5**, chhai Ngièn-su chû-khì-péu chûng thi-ńg vi.

## Chhâm-kháu chṳ̂-liau