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periodicity.
Mass calculator
Periodic table
Period 7Group 8
108Unknown
Hs 270 Atomic mass · u
Transition metals

Hassium

Hassium is a chemical element with symbol Hs and atomic number 108, named after the German state of Hesse. 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, 269Hs, has a half-life of approximately 9.7 seconds, although an unconfirmed metastable state, 277mHs, may have a longer half-life of about 130 seconds. More than 100 atoms of hassium have been synthesized to date.

Discovery 1984 (Gesellschaft für Schwerionenforschung)
Hassium electron shellsHs108 protons
K2L8M18N32O32P14Q2
A simplified shell model. Electron positions are illustrative.

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, 6 electrons; 7s, 2 electrons;

[Rn] represents 86 core electrons. The full view shows them explicitly.

108 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
Hs HassiumAtomic number 108
UnknownkJ/mol
Ionization energy by atomic number
Atomic numberGaps indicate unavailable data

About hassium

Appearance
Not recorded
Discovery
1984 (Gesellschaft für Schwerionenforschung)

A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.