PLUTONIUM

The plutonium is the second element of the series of the actínidos in being an overdraft. His atomic number is 94. For the present of major importance it is the isotope 239 Pu, which has an average life of more than 20000 years. It is a metallic radioactive element that is in use in reactors and nuclear weapon. It is one of the elements transuránicos of the group of the actínidos of the periodic system. His name derives from the Roman god of the hells, Pluto (mythology).
The isotopes of the plutonium were prepared and studied by the first time by the American chemist Glenn T. Seaborg and his companions of the University of California in Berkeley, in 1940. They have found minor quantities of the element in the mines of uranium, but at present relatively big quantities of plutonium are prepared in the nuclear reactors.
Information obtained of www.wikipedia.org and www.webelements.com