Transition metals
Hassium
A superheavy metal of which only a few atoms have been made.
Atomic #108Mass[269]Blockd-blockPeriod7Group8
Hs108 · [269]
3D Atom Explorer
Inside the Hassium atom
Switch between Bohr and Quantum Cloud modes to compare a simple teaching model with a more realistic probability-based view, and follow the guided tour to explore the Hassium atom step by step.
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Electron configuration
[Rn] 5f14 6d6 7s2
A neutral Hassium atom has 108 electrons (equal to its proton count). Choosing a different isotope above changes only the neutron count.
Shell distribution
Shell 12 e⁻Shell 28 e⁻Shell 318 e⁻Shell 432 e⁻Shell 532 e⁻Shell 614 e⁻Shell 72 e⁻
Electrons fill inner shells before outer ones; the outermost (valence) shell drives the element's chemistry.
Properties
Physical & atomic properties
- State (room temp)
- Unknown
- Melting point
- —
- Boiling point
- —
- Density
- —
- Electronegativity
- —
- Atomic radius
- —
- 1st ionization energy
- 730 kJ/mol
- Category
- Transition metals
History
Discovery & naming
- Discovered
- 1984
- Discovered by
- GSI Darmstadt team
- Origin of name
- Latin 'Hassia', the German state of Hesse.
Notable uses
Scientific research only.
Cosmic origin
Where Hassium comes from
Human synthesis
Synthetic, made by cold fusion of lead and iron nuclei in an accelerator.
Simplified origin map — many elements form through more than one astrophysical pathway.
Summary
- Atomic number
- 108
- Atomic mass
- [269]
- Category
- Transition metals
- Group · Period
- 8 · 7
- Block
- d-block
- Shells
- 2 · 8 · 18 · 32 · 32 · 14 · 2