Árgọ̀nù

Árgọ̀nù,₁₈Ar

Árgọ̀nù
Pípè	/ˈɑːrɡɒn/​(AR-gon)
Ìhànsójú	colorless gas exhibiting a lilac/violet glow when placed in a high voltage electric field
Ìwúwo átọ̀mùAr, std(Ar)	[39.792,39.963] conventional:39.95
Árgọ̀nù ní orítábìlì àyè
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 klorínì←árgọ̀nù→potassium
Nọ́mbà átọ̀mù(Z)	18
Ẹgbẹ́	group 18 (noble gases)
Àyè	àyè 3
Àdìpọ̀	Àdìpọ̀-p
Ẹ̀ka ẹ́límẹ́ntì	Ẹ̀fúùfù abíire
Ìtò ẹ̀lẹ́ktrọ́nù	[Ne] 3s23p6
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 8
Àwọn ohun ìní ara
ÌfarahànatSTP	gas
Ìgbà ìyọ́	83.80K​(−189.35 °C, ​−308.83 °F)
Ígbà ìhó	87.30 K ​(−185.85 °C, ​−302.53 °F)
Kíki(at STP)	1.784 g/L
when liquid (atb.p.)	1.40 g/cm3
Triple point	83.8058 K, ​69 kPa
Critical point	150.87 K, 4.898 MPa
Heat of fusion	1.18kJ/mol
Heat of	6.43 kJ/mol
Molar heat capacity	5R/2 = 20.786 J/(mol·K)
pressure P(Pa) 1 10 100 1 k 10 k 100 k atT(K) 47 53 61 71 87
Atomic properties
Oxidation states	0
Electronegativity	Pauling scale: no data
energies	(more)
Covalent radius	106±10pm
Van der Waals radius	188pm
Color lines in a spectral range Spectral linesof árgọ̀nù
Other properties
Natural occurrence	primordial
Crystal structure	​(fcc)
Speed of sound	(gas, 27 °C) 323m/s
Thermal conductivity	17.72x10-3W/(m·K)
Magnetic ordering	diamagnetic
CAS Number	7440–37–1
History
Discovery	Lord RayleighandWilliam Ramsay(1894)
First isolation	Lord Rayleigh and William Ramsay(1894)
Mainisotopes of árgọ̀nù
Iso­tope Abun­dance Half-life(t1/2) Decay mode Pro­duct 36Ar 0.337% 36Ar isstablewith 18neutrons 37Ar syn 35d ε 0.813 37Cl 38Ar 0.063% 38Ar isstablewith 20neutrons 39Ar trace 269y β− 0.565 39K 40Ar 99.600% 40Ar isstablewith 22neutrons 41Ar syn 109.34min β− 2.49 41K 42Ar syn 32.9y β− 0.600 42K

Árgọ̀nùjeelimenti kemikakan to ni ami-idamoAratinomba atomu18. O wa ninuegbe 18 (awon efuufu abiire)loritabili idasiko awon elimenti.Argonu ni efuufu keta to wopo julo ninuafefeayika Aye,ni 0.93% (9,300 ppm), eyi so di eyi to repete ni ona bi 23.8 bi ti efuufu inu afefeayika tto wopo julo to tele, eyundioksidi karbonu(390 ppm), ati to po repete ni ona to to 500 bi ti efuufu abiire keji to wopo, eyunneonu(18 ppm). Bi gbogbo argonu yi lo jeargonu-40radiogenikito wa lati itukapotassium-40ninu igbele Aye. Ni agbalaaye,argonu-36ni isotopu argonu to wopo julo, nitoripe o je isotopu argonu to je dida pelu stellarikojonukleuirawo ninu awonsupanofa(awon irawo akomonamona).