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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).
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 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 ]
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, symbol Pu, atomic number 94 is a transuranic radioactive element. Date: ... 2.5}} Category:Images by ... Plutonium; Wikijunior:The Elements/Printable ...
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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.