Uranium

Actinide · 238.0289 u · group 3, period 7

Uranium · U

Atomic number92

SymbolU

CategoryActinide

Standard stateSolid

Group · Period · Block3 · 7 · f

Electron configuration[Rn]7s2 5f3 6d1

Atomic mass238.0289 u

Atomic radius240 pm

Protons / Neutrons / Electrons92 / 146 / 92

Shells (e⁻ per shell)2, 8, 18, 32, 21, 9, 2

Electronegativity (Pauling)1.38

Ionization energy6.194 eV

Electron affinity—

Oxidation states+6, +5, +4, +3

Melting point1.41e+3 K · 1.13e+3 °C

Boiling point4.40e+3 K · 4.13e+3 °C

Density18.95 g/cm³

Year discovered1789

CPK color

#008FFF

State at room temp (25 °C)

solid

Position

1 in library