Db Dubnium     Atomic number : 105 
    Relative atomic mass (12C = 12.0000) :  262.114 (Db-262) 
    P H Y S I C A L     D A T A
Group 5 transition metal
 
Density / kg m-3 :  29 000
 
Melting point / K :  n.a. 
 
Boiling point / K :  n.a.
 
    D I S C O V E R Y
Isotopes 260 and 261 were tentatively reported in 1967 by a group of scientists at Dubna, near Moscow, Russio. Isotope 260 was confirmed at both Berkeley, California, USA and Dubna in 1970.
 
    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. : nil
 
  
 
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 dubnium 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