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
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
Daily dietary intake : nil
Total mass of element
in average (70 kg) person :


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