# Argon

Argon,  18Ar|  |
| Spectral lines of argon |
| Ki-pún sèng-chit |
| Miâ, hû-hō | argon, Ar |
| Gōa-hêng | colorless gas exhibiting a lilac/violet glow when placed in a high voltage electric field |
| Argon tī chiu-kî-piáu lāi ê ūi-tì |
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 | Ne ↑ **Ar** ↓ Kr |
| iâm-sò͘ ← **argon** → Kalium |

 |

 |
| Goân-chú-hoan | 18 |
| Goân-chú-liōng (±) | 39.948(1)  |
| Goân-sò͘ lūi-pia̍t |   hi-iú khì-thé |
| Cho̍k, hun-khu | 18 cho̍k, p khu  |
| Chiu-kî | tē 3 chiu-kî  |
| Tiān-chú pâi-lia̍t | [Ne] 3s2 3p6  |
| per shell | 2, 8, 8 |
| Bu̍t-lí sèng-chit |
| Siòng | khì-thé |
| Iûⁿ-tiám | 83.81 K ​(−189.34 °C, ​−308.81 °F)  |
| Hut-tiám | 87.302 K ​(−185.848 °C, ​−302.526 °F)  |
| Bi̍t-tō͘ at stp (0 °C and 101.325 kPa) | 1.784 g·L−1 |
| 1.3954 g·cm−3  |
| Sam-siòng-tiám | 83.8058 K, ​68.89 kPa  |
| Lîm-kài-tiám | 150.687 K, 4.863 MPa  |
| Iûⁿ-hoà-jia̍t | 1.18 kJ·mol−1  |
| Cheng-hoat-jia̍t | 6.53 kJ·mol−1  |
| Jia̍t-iông-liōng | 20.85 J·mol−1·K−1  |
| **cheng-khì-ap**

|  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- |
| P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
| tī T (K) |   | 47 | 53 | 61 | 71 | 87 |

 |
| Goân-chú sèng-chit |
| Sng-hòa-sò͘ | **0** |
| Tiān-hū-tō͘ | Pauling scale: no data  |
| Tiān-lī-lêng | 1st: 1520.6 kJ·mol−1  2nd: 2665.8 kJ·mol−1  3rd: 3931 kJ·mol−1  (more)  |
| Kiōng-kè pòaⁿ-kèng | 106±10 pm  |
| Van der Waals pòaⁿ-kèng | 188 pm  |
| Cha̍p-lio̍k |
| Chiⁿ-thé kò͘-chō |  ​face-centered cubic (fcc) |
| Siaⁿ-sok | 323 m·s−1 (gas, at 27 °C) |
| Jia̍t-thoân-tō-lu̍t | 17.72×10-3  W·m−1·K−1  |
| Chû-sèng | diamagnetic  |
| CAS teng-kì pian-hō | 7440-37-1  |
| Le̍k-sú |
| Hoat-hiān kap siōng chá ê tông-ūi-sò͘ | Lord Rayleigh and William Ramsay (1894) |
| Chòe ún-tēng ê tông-ūi-sò͘ |
| Chú bûn-chiong: argon ê tông-ūi-sò͘ |
|

| iso | NA | half-life | DM | DE (MeV) | DP |
| --- | --- | --- | --- | --- | --- |
| 36Ar | 0.337% | – | (β+β+) | 0.4335 | 36S |
| 37Ar | syn | 35 d | ε | 0.813 | 37Cl |
| 38Ar | 0.063% | 38Ar is stable with 20 neutrons |
| 39Ar | trace | 269 y | β− | 0.565 | 39K |
| 40Ar | 99.600% | 40Ar is stable with 22 neutrons |
| 41Ar | syn | 109.34 min | β− | 2.49 | 41K |
| 42Ar | syn | 32.9 y | β− | 0.600 | 42K |

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

**Argon** sī tī chiu-kî-pió ê 1 chióng hoà-ha̍k goân-sò͘, goân-chú-hoan 18.

## Chham-khó