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


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.
Unauthorised reproduction of any aspect of this site is strictly prohibited.
NetElements II last modified October 27th, 1999