About dubnium

Dubnium is a chemical element with the symbol Db and atomic number 105. It is a transition metal in group 5, period 7, d-block. The element was discovered in 1967. It is named after Dubna, Russia. Its bulk properties have never been measured because only a few atoms have been made; it is expected to be a solid at room temperature.

Dubnium electron configuration

The electron configuration of dubnium is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d³, or in short [Rn] 7s² 5f¹⁴ 6d³. Its electrons occupy 7 shells: K = 2, L = 8, M = 18, N = 32, O = 32, P = 11, Q = 2. For transition metals, valence electrons are counted from the 7s and 6d subshells: 2 + 3 = 5, matching group 5. For this superheavy element the configuration is a theoretical prediction.

Filling order: 1s²(2) → 2s²(4) → 2p⁶(10) → 3s²(12) → 3p⁶(18) → 4s²(20) → 3d¹⁰(30) → 4p⁶(36) → 5s²(38) → 4d¹⁰(48) → 5p⁶(54) → 6s²(56) → 4f¹⁴(70) → 5d¹⁰(80) → 6p⁶(86) → 7s²(88) → 5f¹⁴(102) → 6d³(105)

Uses of dubnium

Dubnium has no practical use outside research, because it can only be made a few atoms at a time in particle accelerators.

Safety

Only a handful of dubnium atoms have ever been made and they decay very quickly, so it is never handled in an ordinary laboratory.

Other elements in group 5

Frequently asked questions

What is the electron configuration of dubnium?

The electron configuration of dubnium (Db, atomic number 105) is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d³, or [Rn] 7s² 5f¹⁴ 6d³ in short. By shell: 2, 8, 18, 32, 32, 11, 2.

How many valence electrons does dubnium have?

Dubnium has 5 valence electrons.

Which group and period is dubnium in?

Dubnium is in group 5, period 7, d-block.

What is the atomic mass of dubnium?

Dubnium has no stable isotope, so the mass number of its longest-lived isotope, [268], is given.