Rhenium (Re)

Rhenium is a chemical element with symbol Re and atomic number 75. It is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table.

Atomic Number

75

Atomic Mass

186.21 u

Category

transition metal

Phase

solid

Density

21.02 g/cm³

Electron Shells

2, 8, 18, 32, 13, 2

Atomic Structure

Protons: 75 • Electrons: 75 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d⁵

Discovery

1925 • Ida Noddack, Walter Noddack, Otto Berg