# ආගන්

Argon, 00Ar|  |
| Argon |
| Appearance | colorless gas exhibiting a lilac/violet glow when placed in an electric field |
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| Standard atomic weight *A*r°(Ar) |
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| Argon in the periodic table |
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|  |  |  |
| --- | --- | --- |
| Hydrogen |  | Helium |
| Lithium | Beryllium |  | Boron | Carbon | Nitrogen | Oxygen | Fluorine | Neon |
| Sodium | Magnesium |  | Aluminium | Silicon | Phosphorus | Sulfur | Chlorine | Argon |
| Potassium | Calcium |  | Scandium | Titanium | Vanadium | Chromium | Manganese | Iron | Cobalt | Nickel | Copper | Zinc | Gallium | Germanium | Arsenic | Selenium | Bromine | Krypton |
| Rubidium | Strontium |  |  | Yttrium | Zirconium | Niobium | Molybdenum | Technetium | Ruthenium | Rhodium | Palladium | Silver | Cadmium | Indium | Tin | Antimony | Tellurium | Iodine | Xenon |
| Caesium | Barium | Lanthanum | Cerium | Praseodymium | Neodymium | Promethium | Samarium | Europium | Gadolinium | Terbium | Dysprosium | Holmium | Erbium | Thulium | Ytterbium | Lutetium | Hafnium | Tantalum | Tungsten | Rhenium | Osmium | Iridium | Platinum | Gold | Mercury (element) | Thallium | Lead | Bismuth | Polonium | Astatine | Radon |
| Francium | Radium | Actinium | Thorium | Protactinium | Uranium | Neptunium | Plutonium | Americium | Curium | Berkelium | Californium | Einsteinium | Fermium | Mendelevium | Nobelium | Lawrencium | Rutherfordium | Dubnium | Seaborgium | Bohrium | Hassium | Meitnerium | Darmstadtium | Roentgenium | Copernicium | Nihonium | Flerovium | Moscovium | Livermorium | Tennessine | Oganesson |

 | Ne ↑ **Ar** ↓ Kr |
| ක්ලෝරීන් ← **argon** → පොටෑසියම් |

 |

 |
| Group | group 18 (noble gases) |
| Period | period 3 |
| Block |   p-block |
| Electron configuration | [Ne] 3s2 3p6 |
| Electrons per shell | 2, 8, 8 |
| Physical properties |
| Phase at STP | gas |
| Melting point | 83.81 K ​(−189.34 °C, ​−308.81 °F)  |
| Boiling point | 87.302 K ​(−185.848 °C, ​−302.526 °F)  |
| Density (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 |

 |
| Atomic properties |
| 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  |
| Other properties |
| Natural occurrence | primordial |
| Crystal structure |  ​face-centered cubic (fcc) |
| Thermal conductivity | 17.72×10−3  W/(m⋅K)  |
| Magnetic ordering | diamagnetic  |
| Molar magnetic susceptibility | −19.6×10−6 cm3/mol |
| Speed of sound | 323 m/s (gas, at 27 °C) |
| CAS Number | 7440-37-1  |
| History |
| Discovery and first isolation | Lord Rayleigh and William Ramsay (1894) |
| Isotopes of argon   |
| Template:infobox argon isotopes does not exist |
|

**ආගන්** යනු පරමාණුක ක්‍රමාංකය 18 වූ මූලද්‍රව්‍යයයි. එහි රසායනික සංකේතය Ar ය. ආගන් ඒක පරමාණුක වායුවකි. ආවර්තිතා වගුවේ VIII / 0 (8) කාණ්‍ඩයේ සිටී. ආගන් උච්ච වායුවකි. ආගන් හි ඉලෙට්‍රොනික වින්‍යාසය 2,8,8 වේ. ආවර්තය 3 වන අතර කාන්ඩය VIII / 0 වේ. අයනය නොසාදයි. ප්‍රධාන සංයුජතාව 0 වේ.

## මූලාශ්‍ර