Pu Plutonium     Atomic number : 94 
    Relative atomic mass (12C = 12.0000) :  244.0642 (Pu-244) 
    P H Y S I C A L     D A T A
Group 3 actinide
Density / kg m-3 :  19 840 () [298 K]; 16 623 [liquid at m.p.]
Melting point / K :  914 
Boiling point / K :  3505
    D I S C O V E R Y
Plutonium was discovered in 1940 by G.T. Seaborg, A.C. Wahl and J.W. Kennedy at Berkeley, California, USA.
    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. : plutonium is present in minute quantities in uranium ores, and is formed when one of the emitted neutrons, from a uranium atom undergoing fission, is captured by another uranium nucleus which then undergoes beta-emission to give first neptunium, then plutonium.
Seawater / p.p.m. : nil
    B I O L O G I C A L     D A T A
Level in humans
Organs: n.a., but extremely low
Daily dietary intake : nil
Total mass of element
in average (70 kg) person :
n.a., but extremely low


NetElements II  

A portrait of plutonium 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