92
U
238.03
Uranium (U)
Element 92 · Period 7 · Actinide series
actinide
solid at room temp
f-block
radioactive
About Uranium
Primary fuel for nuclear reactors. U-235 is fissile. Dense metal also used in kinetic penetrators.
Physical Properties
Atomic Mass
238.03 u
State at 25°C
Solid
Melting Point
1132.3 °C
Boiling Point
3818 °C
Density
19.1 g/cm³
Magnetism
Paramagnetic
Atomic Properties
Electron Configuration
[Rn] 5f³ 6d¹ 7s²
Electron Shells
2, 8, 18, 32, 21, 9, 2
Electronegativity
1.38
Atomic Radius
240 pm
Ionization Energy
598 kJ/mol
Oxidation States
+3 to +6
Discovery & History
Discovered By
Martin Heinrich Klaproth
Discovery Year
1789
Named By
Martin Heinrich Klaproth
Name origin: Planet Uranus
Frequently Asked Questions
- Is Uranium a metal, nonmetal, or metalloid?
- Uranium is classified as a actinide.
- What state is Uranium in at room temperature?
- Uranium is a solid at standard room temperature (25°C).
- What is the atomic mass of Uranium?
- Uranium has an atomic mass of 238.03 atomic mass units (u).
- Who discovered Uranium?
- Uranium was discovered by Martin Heinrich Klaproth in 1789.
- Where is Uranium on the periodic table?
- Uranium is element number 92, located in period 7, part of the actinide series shown below the main table.