Hassium (Hs)

Transition metals · Period 7 · Unknown / not established

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For superheavy elements, many atomic and bulk properties are predictions. Unknown physical states stay unknown; listed estimates are not evidence of bulk measurements.

Element identity

Atomic number (Z): 108
Symbol: Hs
Atomic weight / isotope mass number: [270]
Category: Transition metals
Physical state (reference): Unknown / not established
Period: 7
Group (reference): 8
Block: d

Physical properties

Appearance: Silvery
Density: 41 g·cm⁻³ (predicted; not a bulk measurement)
Melting point: Not available
Boiling point: Not available
Sublimation point: Not available

Atomic and material properties

Electron configuration: [Rn] 5f¹⁴ 6d⁶ 7s²
Electrons per shell: K2 L8 M18 N32 O32 P14 Q2
Oxidation states: 8, 6, 5, 4, 3, 2
Electronegativity (Pauling): Not available
Atomic radius: Not available
Covalent radius: 134 pm
Molar ionization energies: 1st: 733.3 kJ·mol⁻¹ 2nd: 1756.0 kJ·mol⁻¹ 3rd: 2827.0 kJ·mol⁻¹ 4th: 3637.5 kJ·mol⁻¹ 5th: 4940.0 kJ·mol⁻¹ 6th: 6175.1 kJ·mol⁻¹ 7th: 7535.5 kJ·mol⁻¹ 8th: 8857.4 kJ·mol⁻¹
Thermal conductivity: Not available
Molar heat capacity: Not available
Crystal structure: Hexagonal close-packed
CAS number: 54037-57-9

Property source: Wikipedia — Hassium, adapted from the Nuclides App snapshot. Quoted conditions and qualifiers are retained.

Sources and interpretation

Snapshot exported 24 October 2026 from the element assets used by Nuclides. Properties are a reference compilation, not a new evaluation. Missing values are shown as “Not available”. Density and phase depend on temperature, pressure and allotrope; retained conditions are part of the quoted property.

Atomic weight is dimensionless. Parentheses give uncertainty in the last quoted digits. A single integer in square brackets is an isotope mass number, not a standard atomic weight. The snapshot can differ from current evaluations; consult CIAAW standard atomic weights and the IUPAC periodic table for current values and conventions.

Element properties in the App snapshot are adapted from Wikipedia. Each element page links to its source article; text adaptations are available under CC BY-SA 4.0. No third-party images are included.

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