105 Db 268
Dubnium
transition metal
Properties
- Atomic number
- 105
- Atomic mass
- 268 u
- Category
- transition metal
- Group
- 5
- Period
- 7
- Block
- d-block
- State (room temp)
- Solid
- Outer-shell electrons
- 2
- Electronegativity
- -
- Density
- 29.3 g/cm³
- Melting point
- -
- Boiling point
- -
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d³
Noble-gas shorthand: [Rn] 5f¹⁴ 6d³ 7s²
Electrons per shell: 2, 8, 18, 32, 32, 11, 2, which is 2 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
About Dubnium
Dubnium is a chemical element with symbol Db and atomic number 105. It is named after the town of Dubna in Russia (north of Moscow), where it was first produced. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, dubnium-268, has a half-life of approximately 28 hours.
- Discovered by Joint Institute for Nuclear Research
Dubnium: frequently asked questions
- What is Dubnium?
- Dubnium (Db) is the chemical element with atomic number 105. It is a metal: specifically a transition metal.
- What is the atomic number of Dubnium?
- Dubnium's atomic number is 105, which means every Dubnium atom has 105 protons in its nucleus.
- What is the electron configuration of Dubnium?
- The electron configuration of Dubnium is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d3 (noble-gas shorthand: [Rn] 5f14 6d3 7s2). Its electrons are arranged in shells of 2, 8, 18, 32, 32, 11, 2, with 2 in the outermost shell.
- Is Dubnium a metal or a nonmetal?
- Dubnium is a metal: specifically a transition metal.
- What group and period is Dubnium in?
- Dubnium is in group 5 and period 7 of the periodic table.
- Is Dubnium a solid, liquid, or gas?
- At room temperature, Dubnium is a solid.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.