Ar Argon     Atomic number : 18 
    Relative atomic mass (12C = 12.0000) :  39.948 
    P H Y S I C A L     D A T A
Group 18 noble gas
 
Density / kg m-3 :  1656 [40 K]; 1380 [liq., b.p.]; 1.748 [273 K]
 
Melting point / K :  83.78 
 
Boiling point / K :  87.29
 
    D I S C O V E R Y
Argon was discovered in 1894 by Lord Rayleigh (London) and Sir William Ramsay (Bristol), England.
 
    G E O L O G I C A L     D A T A
Abundances
 
Sun (relative to H = 1 × 1012) : 1 × 106
 
Earth's crust / p.p.m. : 1.2
 
Atmosphere / p.p.m. (volume) : 9300
 
Residence time / years : 28 000
 
Oxidation state : 0
 
  
 
Seawater / p.p.m. : 0.45
    B I O L O G I C A L     D A T A
Level in humans
 
Blood / mg dm-3 : trace
 
Bone / p.p.m. : nil
 
Liver / p.p.m. : nil
 
Muscle / p.p.m. : nil
 
  
 
Daily dietary intake : n.a., but low
 
Total mass of element
in average (70 kg) person :
n.a., but small

 

NetElements II  

A portrait of argon is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements.


Text copyright John Emsley 1999.   HTML and page layout copyright Simon Hall 1999.
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NetElements II last modified October 27th, 1999