H Hydrogen     Atomic number : 1 
    Relative atomic mass (12C = 12.0000) :  1.00794 
    P H Y S I C A L     D A T A
Group 1 gas
 
Density / kg m-3 :  76.0 [s., 11 K]; 70.8 [liq., b.p.]; 0.08988 [gas, 273 K]
 
Melting point / K :  14.01 
 
Boiling point / K :  20.28
 
    D I S C O V E R Y
Recognized as an element in 1766 by H. Cavendish at London, England.
 
    G E O L O G I C A L     D A T A
Abundances
 
Sun (relative to H = 1 × 1012) : most abundant element, and taken as standard against which others are measured.
 
Earth's crust / p.p.m. : 1520
 
Atmosphere / p.p.m. (volume) : 0.5
 
Residence time / years : n.a.
 
Oxidation state : I
 
  
 
Seawater / p.p.m. : constituent of water; some dissolved H2 gas.
    B I O L O G I C A L     D A T A
Level in humans
 
Blood / mg dm-3 : constituent of water
 
Bone / p.p.m. : 52 000
 
Liver / p.p.m. : 93 000
 
Muscle / p.p.m. : 93 000
 
  
 
Daily dietary intake : mainly as water
 
Total mass of element
in average (70 kg) person :
7 kg

 

NetElements II  

A portrait of hydrogen 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