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Árgọ̀nù,18Ar![Vial containing a violet glowing gas](https://upload.wikimedia.org/wikipedia/commons/thumb/8/87/Argon_discharge_tube.jpg/220px-Argon_discharge_tube.jpg) |
Árgọ̀nù |
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Pípè | /ˈɑːrɡɒn/(AR-gon) |
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Ìhànsójú | colorless gas exhibiting a lilac/violet glow when placed in a high voltage electric field |
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Ìwúwo átọ̀mùAr, std(Ar) | [39.792,39.963] conventional:39.95[1] |
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Árgọ̀nù ní orítábìlì àyè |
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Nọ́mbà átọ̀mù(Z) | 18 |
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Ẹgbẹ́ | group 18 (noble gases) |
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Àyè | àyè 3 |
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Àdìpọ̀ | Àdìpọ̀-p |
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Ẹ̀ka ẹ́límẹ́ntì | Ẹ̀fúùfù abíire |
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Ìtò ẹ̀lẹ́ktrọ́nù | [Ne] 3s23p6 |
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Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan | 2, 8, 8 |
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Àwọn ohun ìní ara |
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ÌfarahànatSTP | gas |
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Ìgbà ìyọ́ | 83.80K(−189.35 °C, −308.83 °F) |
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Ígbà ìhó | 87.30 K (−185.85 °C, −302.53 °F) |
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Kíki(at STP) | 1.784 g/L |
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when liquid (atb.p.) | 1.40 g/cm3 |
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Triple point | 83.8058 K, 69 kPa |
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Critical point | 150.87 K, 4.898 MPa |
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Heat of fusion | 1.18kJ/mol |
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Heat of | 6.43 kJ/mol |
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Molar heat capacity | 5R/2 = 20.786 J/(mol·K) |
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pressure
P(Pa)
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1
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10
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100
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1 k
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10 k
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100 k
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atT(K)
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47
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53
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61
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71
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87
|
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Atomic properties |
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Oxidation states | 0 |
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Electronegativity | Pauling scale: no data |
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energies | |
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Covalent radius | 106±10pm |
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Van der Waals radius | 188pm |
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Color lines in a spectral rangeSpectral linesof árgọ̀nù |
Other properties |
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Natural occurrence | primordial |
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Crystal structure | (fcc) |
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Speed of sound | (gas, 27 °C) 323m/s |
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Thermal conductivity | 17.72x10-3W/(m·K) |
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Magnetic ordering | diamagnetic[2] |
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CAS Number | 7440–37–1 |
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History |
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Discovery | Lord RayleighandWilliam Ramsay(1894) |
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First isolation | Lord Rayleigh and William Ramsay(1894) |
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Mainisotopes of árgọ̀nù |
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Àdàkọ:Category-inline |references |
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).