Argon
    

 Atomic No. Order:
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 Alphabetic Order:
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 Periodic Table

Ground State Electron Configuration

  2, 8,  

  8  

 

  He
 2		Ne
10		Ar
18		Kr
36		  Xe
54		  Rn
86		Uuo
118		Uho
168		Buo
218

Argon

SymbolAr
Atomic Number18
Noble gas
Relative Atomic Mass
12C = 12.0000		39.948  (±1) [Since 1979]
Atomic Radius  pm97
First Ionisation Energy
kJ mol -1		1520.4
Ionisation Energy (eV)15,7596
Electronegativity 
Density
kg m -3		1656 [40 K]
1380 [b.p.]
1.784 [273 K]
Molar Volume   cm 324.12 [40K]
Thermal Conductivity
W m -1 K -1		0.0177 [300 K]
Melting Point   K83.78
Boiling Point   K87.29
Number of Isotopes15
Isotope Atomic mass/u Mole fraction36Ar 35.967 546 26(27) 0.003 365(30)
38Ar 37.962 7322(5) 0.000 632(5)
40Ar 39.962 383 124(5) 0.996 003(30)
 
Inner + outer Shells
  2  +  1   =3
Inner + outer Orbitals
  10  +  8   =18
Filling Orbital
  3p 6   
Ground State Electron
Configuration 
[Ne]  3s 2    3p 6  = [Ar]
Ground State Electron
Configuration with
free Orbitals (n= 0)

 

  0, 0, 0  

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Ground State Electron
Configuration with
compressed Orbitals (n=10)

 

  0, 0, 10  

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Singularity
28= 10+8+0+10
 spd fghij
12       
2

2

6      
3

2

610     
4        
5        
6        
 
Term Symbol1S 0
DiscoveryIt was discovered in 1894 by the Scottish chemist  Sir William Ramsay (Bristol, England) and the  physicist Robert John Strutt (Lord Rayleigh London, England) in liquefied air. Rayleigh's initial interest derived from a problem posed by the English physicist Henry Cavendish in 1785, i.e., when oxygen and nitrogen were removed from air, there was an unknown residual gas remaining.
 
Name Derived FromThe name derives from the Greek argos for "lazy" or "inactive" because it does not combine with other elements.
 

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APSIDIUM  ©  Created:    2002- 06-04    This page as PDF-file
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