Chemical element · Atomic number 92
Uranium
Uranium in the periodic table: atomic number 92, electron configuration, atomic mass, physical data, oxidation states, media credit and visible sources.
Actinide
solid
238.0289 u
Documented element sampleA glass ampoule containing one gram of depleted uranium metal under argon.
Image credit: 范皓程
Auto-oriented, limited to 1600 × 1200 pixels and re-encoded as WebP; the subject was not altered.
Atomic classification
Shell occupancy
Uranium in the Bohr shell model
This shows the electron distribution of the neutral atom in a simplified shell model.
- K · n=1
- 2 electrons
- L · n=2
- 8 electrons
- M · n=3
- 18 electrons
- N · n=4
- 32 electrons
- O · n=5
- 21 electrons
- P · n=6
- 9 electrons
- Q · n=7
- 2 electrons
- Electron configuration
- [Rn]7s2 5f3 6d1
- Electrons per shell
- 2 · 8 · 18 · 32 · 21 · 9 · 2
- Group
- not reported
- Period
- 7
- Block
- F
- Element category
- Actinide
Physical and chemical properties
- Atomic mass
- 238.0289 u
- Standard state
- solid
- Density
- 18.95 g/cm³
- Melting point
- 1,408 K
- Boiling point
- 4,404 K
- Electronegativity
- 1.38 (Pauling)
- First ionisation energy
- 6.194 eV
- Oxidation states
- +6, +5, +4, +3
- Discovery
- 1789
Safety and periodic classification
Safety
Safe handling cannot be inferred from Uranium's position in the periodic table alone. Laboratory, classroom and disposal decisions must follow the documentation for the exact material and its safety data sheet.
Position and comparison
Uranium is in period 7 and the F block. Its direct neighbours by atomic number are Protactinium and Neptunium. The recorded Pauling electronegativity is 1.38. Periodic trends are compared only through the separately sourced neighbouring values.
Sources and scope
PubChem attributes element data to sources including IUPAC, NIST and IAEA. Quanta stores the referenced snapshot locally and leaves unknown values unavailable.
Where Uranium sits among the 118 elements
The table compares the reported values for Uranium with every other element that carries the same value in the snapshot. A rank is not a judgement, it is orientation: it says how unusual this value is across the periodic table.
| Value | Uranium | Position in the data set |
|---|---|---|
| Melting point | 1,408 K | Rank 41 of 103 elements with a reported value. Highest: Carbon. |
| Boiling point | 4,404 K | Rank 13 of 93 elements with a reported value. Highest: Rhenium. |
| Density | 18.95 g/cm³ | Rank 9 of 96 elements with a reported value. Highest: Osmium. |
| Electronegativity (Pauling) | 1.38 | Rank 56 of 95 elements with a reported value. Highest: Fluorine. |
| Ionisation energy | 6.194 eV | Rank 68 of 102 elements with a reported value. Highest: Helium. |
All values and ranks come from the PubChem Periodic Table snapshot, retrieved on 2026-07-15. Elements without a reported value are excluded, so the population differs per row.
The neighbours of Uranium in the periodic table
- Place in the table
- No group number, period 7, F block. Classified as actinide, solid at standard conditions.
- Direct neighbours
- Atomic number 92. Preceded by Protactinium, followed by Neptunium.
- Discovery
- Recorded in the snapshot as: 1789. Who, where and under what circumstances is not part of that record, so this page carries the sourced year and no discovery narrative.
- Oxidation states
- +6, +5, +4, +3. They follow from the electron configuration [Rn]7s2 5f3 6d1 and indicate which compounds to expect.
Go from looking up chemistry to remembering it.
Turn your notes into source-backed study cards and review them at the right time.
Starter stays free · no payment details