کينډۍ:Infobox argon

Argon,  ₁₈Ar

Vial containing a violet glowing gas
Spectral lines of argon
عمومي خواص
Pronunciation	/ˈɑrɡɒn/ AR-gon
Appearance	colorless gas exhibiting a lilac/violet glow when placed in an electric field
Argon په دوراني جدول کې
Ne ↑ Ar ↓ Kr chlorine ← argon → potassium ‍
اټومي شمیره (Z)	18
گروپ, پیریود	group 18 (noble gases), period 3
بلاک	p-block
Element category	noble gas
معياري اټومي وزن (Ar)	کينډۍ:Val
Electron configuration	[Ne] 3s2 3p6
Electrons per shell	2, 8, 8
فزیکي خواص
حالت (at STP)	گاز
دويلې کيدو ټکى	83.81 K ​(−189.34 °C, ​−308.81 °F)
يشنا ټکی	87.302 K ​(−185.848 °C, ​−302.526 °F)
کثافت (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
اټومي خواص
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
Miscellanea
Crystal structure	​face-centered cubic (fcc) Face-centered cubic crystal structure for argon
Speed of sound	323 m/s (gas, at 27 °C)
د تودوخې تېرېدنه	17.72کينډۍ:E  W/(m·K)
Magnetic ordering	diamagnetic
Magnetic susceptibility (χmol)	−19.6·10−6 cm3/mol
CAS Number	7440-37-1
History
Discovery and first isolation	Lord Rayleigh and William Ramsay (1894)
Main isotopes of argon
آيسو­ټوپ Abun­dance نیم ژوند (t1/2) Decay mode Pro­duct 36Ar 0.334% stable 37Ar syn 35 d ε 37Cl 38Ar 0.063% stable 39Ar trace 269 y β− 39K 40Ar 99.604% stable 41Ar syn 109.34 min β− 41K 42Ar syn 32.9 y β− 42K

Element navigation

PTargonPT

Cl ←

iso 18Ar ibox    wd:Q696

→ K

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