Dubnium (Db)

Dubnium is a chemical element with symbol Db and atomic number 105. It is named after the town of Dubna in Russia, where it was first produced. It is a synthetic element and radioactive.

Atomic Number

105

Atomic Mass

268 u

Category

transition metal

Phase

solid

Density

29.3 g/cm³

Electron Shells

2, 8, 18, 32, 32, 11, 2

Atomic Structure

Protons: 105 • Electrons: 105 • Neutrons: Varies by isotope

Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d³

Discovery

1970 • Georgy Flerov, Albert Ghiorso