Uranium

Koushik 26/06/2026 19:58:09 Updated 26/06/2026 19:58:09

Property	Value
Atomic Number	92
Element	Uranium
Symbol	U
Atomic Mass	238.028 u
Number of Neutrons	146 (most common isotope, Uranium-238)
Number of Protons	92
Number of Electrons	92
Period	7
Group	Actinide (no fixed group number)
Phase	Solid
Radioactive	Yes
Natural	Yes
Metal	Yes
Nonmetal	No
Metalloid	No
Type	Actinide
Atomic Radius	240 pm
Electronegativity	1.38 (Pauling scale)
First Ionization Energy	6.194 eV
Density	19.05 g/cm³
Melting Point	1132 °C
Boiling Point	4131 °C
Number of Isotopes	No stable isotopes (U-238, U-235, U-234 most notable)
Discoverer	Martin Heinrich Klaproth
Year	1789
Specific Heat	0.116 J/g·K
Number of Shells	7
Number of Valence Electrons	6