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 — that's 2 in the outermost shell.
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
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.