# Argon

| Argon |
| --- |
| **18Ar** |
|

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| Ne ↑ **Ar** ↓ Kr |

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Periodic table |

 |  |
|  | chlorine ← **argon** → potassium |

 |
| Panagway |
| colorless gas exhibiting a lilac/violet glow when placed in a high voltage electric field   Spectral lines of argon |
| Kinatibuk-ang mga kinaiya |
| Ngalan, simbolo, kaiphan | argon, Ar, 18 |
| Paglitok | /ˈɑːrɡɒn/ |
| Kategoriyang elemento | gas nga halangdon |
| Group, period, block | 18, 3, p |
| Gibug-aton sa atomo | 39.948(1) |
| Kontorno sa elektron | [Ne] 3s2 3p6 2, 8, 8
Electron shells of argon (2, 8, 8) |
| History |
| Pagkadiskobre | Lord Rayleigh and William Ramsay   (1894)  |
| First isolation | Lord Rayleigh and William Ramsay   (1894)  |
| Physical properties |
| Phase | gas |
| Density | (0 °C, 101.325 kPa) 1.784 g/L |
| Liquid density at b.p. | 1.40 g·cm−3 |
| Melting point | 83.80 K, −189.35 °C, −308.83 °F |
| Boiling point | 87.30 K, −185.85 °C, −302.53 °F |
| Triple point | 83.8058 K (-189°C), 69 kPa |
| Critical point | 150.87 K, 4.898 MPa |
| Heat of fusion | 1.18 kJ·mol−1 |
| Heat of vaporization | 6.43 kJ·mol−1 |
| Molar heat capacity | 5R/2 = 20.786 J·mol−1·K−1 |
| Vapor pressure |
|

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

 |
| Atomic properties |
| Oxidation states | **0** |
| Electronegativity | no data (Pauling scale) |
| Ionization energies (more) | 1st: 1520.6 kJ·mol−1 |
| 2nd: 2665.8 kJ·mol−1 |
| 3rd: 3931 kJ·mol−1 |
| Covalent radius | 106±10 pm |
| Van der Waals radius | 188 pm |
| Miscellanea |
| Crystal structure | face-centered cubic
 |
| Magnetic ordering | diamagnetic |
| Thermal conductivity | 17.72x10-3  W·m−1·K−1 |
| Speed of sound | (gas, 27 °C) 323 m·s−1 |
| CAS registry number | 7440–37–1 |
| Most stable isotopes |
| Main article: Isotopes of argon |
|

| iso | NA | half-life | DM | DE (MeV) | DP |
| --- | --- | --- | --- | --- | --- |
| 36Ar | 0.337% | 36Ar is stable with 18 neutrons |
| 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 |

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Ang **argon** mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga **Ar** ug kaiphan nga atomik 18. Ang argon mao ang gas nga halangdon.

## Ang mga gi basihan niini

## Galeriya sa hulagway

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