I Iodine     Atomic number : 53 
    Relative atomic mass (12C = 12.0000) :  126.90447 
    P H Y S I C A L     D A T A
Group 17 non-metal
 
Density / kg m-3 :  4930 [293 K]
 
Melting point / K :  386.7 
 
Boiling point / K :  457.50
 
    D I S C O V E R Y
Discovered in 1811 by Bernard Courtois at Dijon, France.
 
    G E O L O G I C A L     D A T A
Abundances
 
Sun (relative to H = 1 × 1012) : n.a.
 
Earth's crust / p.p.m. : 0.14
 
Atmosphere / p.p.m. (volume) : trace
 
Residence time / years : 300 000
 
Classification : scavenged as I(-I), recycled as I(V)
 
Oxidation state : -I and V, mainly V
 
  
 
Seawater / p.p.m. :
    Atlantic surface : 0.0489
    Atlantic deep : 0.056
    Pacific surface : 0.043
    Pacific deep : 0.058
    B I O L O G I C A L     D A T A
Level in humans
 
Blood / mg dm-3 : 0.057
 
Bone / p.p.m. : 0.27
 
Liver / p.p.m. : 0.7
 
Muscle / p.p.m. : 0.05 - 0.5
 
  
 
Daily dietary intake : 0.1 - 0.2 mg
 
Total mass of element
in average (70 kg) person :
12 - 20 mg

 

NetElements II  

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


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NetElements II last modified October 27th, 1999