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Plutonium is a chemical element; it has symbol Pu and atomic number 94. It is a silvery-gray actinide metal that tarnishes when exposed to air, and forms a dull coating when oxidized . The element normally exhibits six allotropes and four oxidation states .
This infobox must distinguish between three typical (exemplary) elements: E118 (regular element), E119 and E121. Handling of these element infoboxes is hardcoded in the meta-infobox, set by |number= (Z). Theoretical element: above-header shows; Theoretical element Applied: when element is theoretical (E119 and higher).
While the difficulty of obtaining macroscopic samples of synthetic elements in part explains their high value, ... 94: 239 Pu: Plutonium-239: 19.84: 6 490 000: 129 ...
Plutonium compounds are compounds containing the element plutonium (Pu). At room temperature, pure plutonium is silvery in color but gains a tarnish when oxidized. [ 1 ] The element displays four common ionic oxidation states in aqueous solution and one rare one: [ 2 ]
Simulated emission spectrum of neutral Plutonium (Pu I) based on data from the National Institute of Standards and Technology Atomic Spectra Database (NIST ASD). Date: 20 January 2025: Source: Image generated through the NIST ASD website: Author: Kramida, A., Ralchenko, Yu., Reader, J., and NIST ASD Team (2024).
Plutonium-239 is the primary fissile isotope used for the production of nuclear weapons, although uranium-235 is also used for that purpose. Plutonium-239 is also one of the three main isotopes demonstrated usable as fuel in thermal spectrum nuclear reactors, along with uranium-235 and uranium-233. Plutonium-239 has a half-life of 24,110 years. [1]
Watchdogs are raising new concerns about legacy contamination in Los Alamos, the birthplace of the atomic bomb and home to a renewed effort to manufacture key components for nuclear weapons. A ...
Twenty-two plutonium radioisotopes have been characterized. The most stable are 244 Pu with a half-life of 80.8 million years; 242 Pu with a half-life of 373,300 years; and 239 Pu with a half-life of 24,110 years; and 240 Pu with a half-life of 6,560 years. This element also has eight meta states; all have half-lives of less than one second.