105Unknown
Db 268 Atomic mass · uTransition metals
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.
Discovery 1967 (Joint Institute for Nuclear Research)
K2L8M18N32O32P11Q2
Physical properties
Values for the element in its standard state.
- Density
- Not available
- Melting point
- Not available
- Boiling point
- Not available
- Atomic radius
- Not available
- Bonding type
- Not recorded
- Molar heat
- Not available
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 6 electrons; 4d, 10 electrons; 5s, 2 electrons; 5p, 6 electrons; 4f, 14 electrons; 5d, 10 electrons; 6s, 2 electrons; 6p, 6 electrons; 5f, 14 electrons; 6d, 3 electrons; 7s, 2 electrons;
[Rn] represents 86 core electrons. The full view shows them explicitly.
105 electrons Orbital order preserved from source
- Electronegativity
- Not availablePauling scale
- First ionization energy
- Not available
- Electron affinity
- Not available
- Van der Waals radius
- Not available
Db DubniumAtomic number 105
UnknownkJ/mol
Atomic numberGaps indicate unavailable data
About dubnium
- Appearance
- Not recorded
- Discovery
- 1967 (Joint Institute for Nuclear Research)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.