Element 92
Uranium
Actinides
Uranium (U) is in the f-block of the periodic table — group 3, period 7.
Uranium is a chemical element with symbol U and atomic number 92.
Key data
- Atomic number
- 92
- Atomic mass
- 238.029 u
- Group / Period
- 3 / 7
- Block
- f-block
- Phase at STP
- Solid
- Density
- 19.1 g/cm³
- Melting point
- 1132.2 °C
- Boiling point
- 4130.9 °C
- Electron configuration
- [Rn] 5f3 6d1 7s2
Periodic table block
Uranium is in the f-block (group 3, period 7). Elements land in the f-block when their highest-energy electrons fill an f subshell — these are the lanthanides and actinides shown beneath the main table.
New to this? Periodic table blocks explained: s, p, d, and f
Common uses
- •Nuclear power
- •Nuclear weapons
- •Geological dating
Discovery
Year: 1789
Discovered by: Martin Heinrich Klaproth
Frequently asked questions
What is the atomic number of Uranium?
Uranium has atomic number 92. Its symbol is U and its atomic mass is 238.029 u.
What category of element is Uranium?
Uranium is classified as actinides. It sits in group 3, period 7 of the periodic table.
What block of the periodic table is Uranium in?
Uranium is in the f-block (group 3, period 7). Its highest-energy electrons occupy the f subshell — you can see this in its electron configuration, [Rn] 5f3 6d1 7s2.
What is Uranium used for?
Common uses of Uranium include: Nuclear power, Nuclear weapons, Geological dating.
When was Uranium discovered?
Uranium was discovered in 1789 by Martin Heinrich Klaproth.
Play the game
Test your knowledge in The Lab
20-round element ID, cryptic 3-clue guesser, and an interactive periodic table.
Open The Lab →