plutonium

Noun
  1. A solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons;
    Found in minute quantities in uranium ores but is usually synthesized in nuclear reactors;
    13 isotopes are known with the most important being plutonium 239 (synset 114673953)
    is a type of: chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
    subtypes: plutonium 239 - a highly fissionable isotope of plutonium that is used in atomic weapons and as a reactor fuel; produced by irradiating uranium 238 with slow electrons
    same as: atomic number 94, pu

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