# Argon

Argon, 18Ar|  |
| Argon |
| Bigkas |  /ˈɑːrɡɒn/ ​(*AR-gon*) |
| Appearance | colorless gas exhibiting a lilac/violet glow when placed in an electric field |
|  |
| Standard atomic weight *A*r°(Ar) |
|  | * [39.792, 39.963]
* 39.95±0.16 (pinaikli)
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|  |
| Argon sa talahanayang peryodiko |
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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 |
| kloro ← **argon** → potasyum |

 |

 |
| Atomikong bilang (*Z*) | 18 |
| Group | 18 |
| 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  |
| **Mga linyang espektral ng argon** |
| Other properties |
| Natural occurrence | primordiyal |
| Crystal structure |  ​*face-centered cubic* (fcc) (cF4) |
| Lattice constant | *a* = 546.91 pm (at triple point) |
| 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* t
* b
 |
|  |
|

| Main isotopes | Decay |
| --- | --- |
|  | abun­dance | half-life (*t*1/2) | mode | pro­duct |
| 36Ar | 0.334% | stable |
| 37Ar | trace | 35 d | ε | 37Cl |
| 38Ar | 0.0630% | stable |
| 39Ar | trace | 268 y | β− | 39K |
| 40Ar | 99.6% | stable |
| 41Ar | trace | 109.34 min | β− | 41K |
| 42Ar | synth | 32.9 y | β− | 42K |

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Ang **argon** (Espanyol: *argon*, Ingles: *argon*, may sagisag na **Ar**, atomikong bilang na 18, atomikong timbang na 3.94, punto ng pagkatunaw na 189.4 °C, at punto ng pagkulong 185.9 °C) ay isang gas at elementong hindi kumikilos o hindi gumagalaw, walang amoy, at wala ring kulay. Sa pagtataya, ito ang bumubuo ng 1% ng atmospera ng daigdig. Natuklasan ito nina William Ramsay at John Strutt, Ikatlong Baron Rayleigh noong 1894. Isa itong sangkap sa loob ng mga may kuryenteng ilaw at ginagamit ding sangkap sa mga tubong pangradyo.

## Mga sanggunian

 *Ang lathalaing ito na tungkol sa **Kimika** ay isang usbong. Makatutulong ka sa Wikipedia sa pagpapalawig nito.*