# آرگون

Argon,  18Ar| Vial containing a violet glowing gas |
| Spectral lines of argon |
| عمومي خواص |
| Pronunciation |  /ˈɑrɡɒn/ AR**-gon* |
| Appearance | colorless gas exhibiting a lilac/violet glow when placed in an electric field |
|  |
| Argon په دوراني جدول کې |
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 | Ne ↑ Ar ↓ Kr
 |
| chlorine ← argon → potassium
 | ‍
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| اټومي شمیره (*Z*) | 18 |
| گروپ, پیریود | group 18 (noble gases), period 3  |
| بلاک | p-block  |
| Element category |   noble gas |
| معياري اټومي وزن (*A*r) | کينډۍ:Val |
| Electron configuration | [Ne] 3s2 3p6 |
| Electrons per shell | 2, 8, 8 |
| فزیکي خواص |
| حالت (at STP) | گاز |
| دويلې کيدو ټکى | 83.81 K ​(−189.34 °C, ​−308.81 °F)  |
| يشنا ټکی | 87.302 K ​(−185.848 °C, ​−302.526 °F)  |
| کثافت (at STP) | 1.784 g/L |
| when liquid, at b.p. | 1.3954 g/cm3 |
| Triple point | 83.8058 K, ​68.89 kPa  |
| Critical point | 150.687 K, 4.863 MPa  |
| Heat of fusion | 1.18 kJ/mol  |
| Heat of vaporization | 6.53 kJ/mol  |
| Molar heat capacity | 20.85 J/(mol·K)  |
| **Vapor pressure**

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

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| اټومي خواص |
| Oxidation states | **0** |
| Electronegativity | Pauling scale: no data  |
| Ionization energies | * 1st: 1520.6 kJ/mol
* 2nd: 2665.8 kJ/mol
* 3rd: 3931 kJ/mol
* (more)
 |
| Covalent radius | 106±10 pm  |
| Van der Waals radius | 188 pm  |
| Miscellanea |
| Crystal structure |  ​face-centered cubic (fcc)Face-centered cubic crystal structure for argon |
| Speed of sound | 323 m/s (gas, at 27 °C) |
| د تودوخې تېرېدنه | 17.72کينډۍ:E  W/(m·K)  |
| Magnetic ordering | diamagnetic  |
| Magnetic susceptibility (*χ*mol) | −19.6·10−6 cm3/mol |
| CAS Number | 7440-37-1  |
| History |
| Discovery and first isolation | Lord Rayleigh and William Ramsay (1894) |
| Main isotopes of argon |
|

| آيسو­ټوپ
 | Abun­dance
 | نیم ژوند (*t*1/2) | Decay mode
 | Pro­duct
 |
| --- | --- | --- | --- | --- |
| 36Ar
 | 0.334%
 | stable
 |
| 37Ar
 | syn
 | 35 d
 | ε
 | 37Cl
 |
| 38Ar
 | 0.063%
 | stable
 |
| 39Ar
 | trace
 | 269 y
 | β− | 39K
 |
| 40Ar
 | 99.604%
 | stable
 |
| 41Ar
 | syn
 | 109.34 min
 | β− | 41K
 |
| 42Ar
 | syn
 | 32.9 y
 | β− | 42K
 |

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**آرگون** (په انگرېزي: *Argon*) له کیمیاوي عناصرو څخه یو دی چې په تناوبي جدول کې د **Ar** سمبول او ۱۸ اتمي شمېرې په وسیله ښودل شوی دی.

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