Where is uranium placed on the periodic table?
Quick Answer
Uranium is in the actinide series, usually shown in the bottom row of the periodic table. It has atomic number 92 and is the best-known naturally occurring heavy radioactive element.
The Full Story
Uranium is part of the actinide series, with atomic number 92, and is usually displayed in the separate row below the main periodic table. It is radioactive and occurs naturally in small amounts in rocks, soil, and seawater. Uranium-235 is important for nuclear fission, while uranium-238 is much more abundant. Uranium was first identified as an element in 1789, and its isotopes became central to nuclear science in the 20th century.
Key Facts
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