Ac Actinium     Atomic number : 89 
    Relative atomic mass (12C = 12.0000) :  227.0728 (Ac-227) 
    P H Y S I C A L     D A T A
Group 3 transition metal
 
Density / kg m-3 :  10 060 [293 K]
 
Melting point / K :  1320 ± 50 
 
Boiling point / K :  3470 ± 300
 
    D I S C O V E R Y
Discovered in 1899 by Andre Debierne at Paris, 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. : minute traces
 
  
 
Seawater / p.p.m. : nil
    B I O L O G I C A L     D A T A
Level in humans
 
nil
 
  
 
Daily dietary intake : nil
 
Total mass of element
in average (70 kg) person :
nil

 

NetElements II  

A portrait of actinium 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