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 Ar°(Ar)
	[39.792, 39.963] 39.95±0.16 (pinaikli)
Argon sa talahanayang peryodiko
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
Main isotopes Decay abun­dance half-life (t1/2) 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

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.

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