| Formula / Notation | U |
|---|---|
| CAS Number | 7440-61-1 |
| Molecular Weight | 238.03 |
| Melting Point | 1132.0 |
| Boiling Point | 4131.0 |
| Density | 19.1 |
| Appearance | Silvery-grey lustrous metal, hard and malleable |
| Also Known As | U, uranium metal, natural uranium |
| Category | Elements |
What is Uranium?
Uranium is a silvery-grey radioactive metal with atomic number 92, the heaviest naturally occurring element. It was discovered in 1789 by Martin Heinrich Klaproth. Uranium has three naturally occurring isotopes: U-238 (99.27%), U-235 (0.72%), and U-234 (0.006%). U-235 is fissile — it can sustain a nuclear chain reaction. The element is named after the planet Uranus.
Formula & Notation
IUPAC Name: Uranium
Other Names / Synonyms: U, uranium metal, natural uranium
Properties & Characteristics
Physical Data
| Property | Value |
|---|---|
| Melting Point | 1132.0 |
| Boiling Point | 4131.0 |
| Density | 19.1 |
| Molecular Weight | 238.03 |
| Appearance | Silvery-grey lustrous metal, hard and malleable |
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Uranium is a silvery-grey radioactive metal with atomic number 92, the heaviest naturally occurring element. It was discovered in 1789 by Martin Heinrich Klaproth. Uranium has three naturally occurring isotopes: U-238 (99.27%), U-235 (0.72%), and U-234 (0.006%). U-235 is fissile — it can sustain a nuclear chain reaction. The element is named after the planet Uranus.
Nuclear fuel: U-235 used in nuclear reactors (enriched to 3–5%) and weapons (enriched to >90%). Depleted uranium (mostly U-238): armor-piercing ammunition and radiation shielding. Historical: uranium glass (yellow/green fluorescent glass). Uranium compounds: used in photography, ceramics (orange-red…
Radioactive — all isotopes emit alpha particles; some also emit beta and gamma radiation. Alpha emitter: dangerous if inhaled or ingested. Heavy metal toxicity: nephrotoxic (kidney damage). Depleted uranium: lower radioactivity but heavy metal toxicity concern. Natural uranium: regulated under nucle…
The formula or notation for Uranium is: U