Search results
Results From The WOW.Com Content Network
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 .
Plutonium (94 Pu) is an artificial element, except for trace quantities resulting from neutron capture by uranium, and thus a standard atomic weight cannot be given. Like all artificial elements, it has no stable isotopes. It was synthesized long before being found in nature, the first isotope synthesized being 238 Pu in 1940.
Plutonium (Pu, atomic number 94), first synthesized in 1940, is another such element. It is the element with the largest number of protons (atomic number) to occur in nature, but it does so in such tiny quantities that it is far more practical to synthesize it. Plutonium is known mainly for its use in atomic bombs and nuclear reactors. [4]
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. It reacts with carbon, halogens, nitrogen, silicon, and hydrogen.
niobium-94: 20,300 640 plutonium-239: 24,110 761 10 12 seconds (teraseconds) isotope half-life millennia 10 12 seconds ... Lists of isotopes, by element; Notes
The discoverers of plutonium (element 94) considered naming it "ultimium", thinking it was the last. [18] Following the discoveries of heavier elements, of which some decayed in microseconds, it then seemed that instability with respect to spontaneous fission would limit the existence of heavier elements.
Hydrogen is the element with atomic number 1; helium, atomic number 2; lithium, atomic number 3; and so on. ... neptunium (element 93), and plutonium (element 94). ...
The element 93, ausenium, was named after a Greek name of Italy, Ausonia. [3] The element 94, hesperium, was named in Italian Esperio after Hesperia, a poetic name of Italy. [1] Fascist authorities wanted one of the elements to be named littorio after the Roman lictores who carried the fasces, a symbol appropriated by Fascism. [1]