Element 108 · Transition metal
Hassium (Hs) — Element 108
Latin Hassia — Hesse
Hassium (Hs) is a transition metal in Period 7, Group 8 of the periodic table with atomic number 108, standard atomic weight [277] u, and ground-state electron configuration [Rn] 5f¹⁴ 6d⁶ 7s². At standard temperature and pressure it is classified as a short-lived synthetic nuclide with 8 valence electrons and common oxidation states +8.
Research only
What are the atomic properties and physical constants of Hassium?
Reference constants compiled from IUPAC standard atomic weights, the NIST Atomic Spectra Database, and the CRC Handbook.
- Atomic number (Z)
- 108
- Standard atomic mass
- [277] u
- Chemical family
- Transition metal
- Ground-state configuration
- [Rn] 5f¹⁴ 6d⁶ 7s²
- Electrons per shell
- 2, 8, 18, 32, 32, 14, 2
- Valence electrons
- 8
- Common ion charges / oxidation states
- +8
- Phase at STP
- Synthetic
- Pauling electronegativity
- —
- First ionization energy
- —
- Atomic radius
- —
- Melting point
- —
- Boiling point
- —
- Discovery year
- 1984
- Table coordinate
- Period 7, Group 8
- Radioactivity
- Radioactive (no stable isotopes)
How are electrons arranged across Hassium’s shells?
A neutral Hassium atom contains 108 electrons distributed across 7 occupied principal energy shells ([Rn] 5f¹⁴ 6d⁶ 7s²). The table below compares Hassium’s shell occupancy against each shell’s theoretical 2n² capacity.
| Principal Shell (n) | Spectroscopic Letter | Electrons in Hs | Max Shell Capacity (2n²) |
|---|---|---|---|
| n = 1 | K | 2 e⁻ | 2 e⁻ |
| n = 2 | L | 8 e⁻ | 8 e⁻ |
| n = 3 | M | 18 e⁻ | 18 e⁻ |
| n = 4 | N | 32 e⁻ | 32 e⁻ |
| n = 5 | O | 32 e⁻ | 50 e⁻ |
| n = 6 | P | 14 e⁻ | 72 e⁻ |
| n = 7 | Q | 2 e⁻ | 98 e⁻ |
Frequently Asked Questions about Hassium (Hs)
What is the atomic mass and atomic number of Hassium (Hs)?
Hassium (Hs) has atomic number Z = 108 (108 protons in its nucleus) and an IUPAC standard atomic weight of [277] u. It sits in Period 7, Group 8 and is classified as a transition metal.
What is the ground-state electron configuration of Hassium?
The neutral ground-state electron configuration of Hassium (Z = 108) is [Rn] 5f¹⁴ 6d⁶ 7s². Across its 7 occupied principal shells (n = 1 to n = 7), the electrons per shell are 2, 8, 18, 32, 32, 14, 2, with 8 valence electrons participating in bonding.
What are the common ion charges and electronegativity of Hassium?
Hassium commonly forms +8 oxidation states or ion charges in compounds. Its Pauling electronegativity is — and its first ionization energy is —.
When was Hassium discovered and what is it used for?
Hassium was discovered in 1984 (Latin Hassia — Hesse). Research only
How does Hassium compare to neighboring elements?
Other transition metal elements: