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Plutonium is a chemical element; it has symbol Pu and atomic number 94. ... which passed without notice into the periodic table. ...
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]
Like the periodic table, the list below organizes the elements by the number of protons in their atoms; it can also be organized by other properties, such as atomic weight, density, and electronegativity. For more detailed information about the origins of element names, see List of chemical element name etymologies.
Plutonium, 94 Pu; Plutonium; Pronunciation / p l uː ˈ t oʊ n i ə m / (ploo-TOH-nee-əm) Allotropes: see Allotropes of plutonium: Appearance: silvery white, tarnishing to dark gray in air: Mass number [244] Plutonium in the periodic table
The periodic table, ... (element 93), and plutonium (element 94). [12] ... Periodic tables usually at least show the elements' symbols; many also provide ...
Unstable isotopes decay through various radioactive decay pathways, most commonly alpha decay, beta decay, or electron capture. Many rare types of decay, such as spontaneous fission or cluster decay, are known. (See Radioactive decay for details.) [citation needed] Of the first 82 elements in the periodic table, 80 have isotopes considered to ...
A synthetic, radioactive element, curium is a hard, dense metal with a silvery-white appearance and physical and chemical properties resembling gadolinium. Its melting point of 1344 °C is significantly higher than that of the previous elements neptunium (637 °C), plutonium (639 °C) and americium (1176 °C).
Named after the dwarf planet Pluto (then considered to be the ninth planet), because it was discovered directly after element neptunium and is higher than element uranium in the periodic table. Thus, plutonium was named by analogy with the ordering of the planets, ending with Pluto.