Rutherfordium (Rf)

Rutherfordium is a synthetic chemical element with symbol Rf and atomic number 104, named in honor of physicist Ernest Rutherford. It is a transactinide element in the fourth transition series of the periodic table.

Atomic Number

104

Atomic Mass

267 u

Category

transition metal

Phase

solid

Density

23.2 g/cm³

Electron Shells

2, 8, 18, 32, 32, 10, 2

Atomic Structure

Protons: 104 • Electrons: 104 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d²

Discovery

1969 • Georgy Flerov, Albert Ghiorso