Uranium (U)

Uranium is a chemical element with symbol U and atomic number 92. It is a silvery-white metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons.

Atomic Number

92

Atomic Mass

238.03 u

Category

actinide

Phase

solid

Density

19.1 g/cm³

Electron Shells

2, 8, 18, 32, 21, 9, 2

Atomic Structure

Protons: 92 • Electrons: 92 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f³ 6d¹

Discovery

1789 • Martin Heinrich Klaproth