Plutonium is element 94, an actinoid of the f block, in period 7. Its ground-state configuration is [Rn] 5f6 7s2, and it usually shows the oxidation states 0, 3, 4, 5, 6.
It was discovered in 1940, by Seaborg.
Name origin: Pluto, a dwarf planet in the Solar System.
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