Hassium Element Facts

The chemical element hassium is classed as a transition metal. It was discovered in 1984 by a team led by Peter Armbruster and Gottfried M├╝nzenber.

The Experimental Storage Ring.
Hassium was discovered in Darmstad

New elements can no longer be discovered in test-tubes. This is the Experimental Storage Ring, forming part of the equipment used in heavy element research at Darmstadt. Image Ref. (1)


Data Zone

Classification: Hassium is a transition metal
Atomic weight: (269), no stable isotopes
State: solid (presumed)
Melting point:
Boiling point:
Electrons: 108
Protons: 108
Neutrons in most abundant isotope: 161
Electron shells: 2,8,18,32,32,14,2
Electron configuration: 5f14 6d6 7s2
Density @ 20oC:
Show more, including: Heats, Energies, Oxidation, Reactions, Compounds, Radii, Conductivities
Atomic volume:
Specific heat capacity
Heat of fusion
Heat of atomization
Heat of vaporization
1st ionization energy
2nd ionization energy
3rd ionization energy
Electron affinity
Minimum oxidation number
Min. common oxidation no.
Maximum oxidation number
Max. common oxidation no.
Electronegativity (Pauling Scale)
Polarizability volume
Reaction with air
Reaction with 15 M HNO3
Reaction with 6 M HCl
Reaction with 6 M NaOH
Atomic radius
Ionic radius (1+ ion)
Ionic radius (2+ ion)
Ionic radius (3+ ion)
Ionic radius (1- ion)
Ionic radius (2- ion)
Ionic radius (3- ion)
Thermal conductivity
Electrical conductivity
Freezing/Melting point:

Discovery of Hassium

Hassium was first made by a team led by Peter Armbruster and Gottfried Münzenber at the Heavy Ion Research Laboratory in Darmstadt, Germany in 1984.

They bombarded lead-208 with iron-58 nuclei to produce three atoms of hassium.

The name hassium is derived from the Latin name for the German state of Hesse.

Appearance and Characteristics

Harmful effects:

Hassium is harmful due to its radioactivity.


Hassium is a synthetic, radioactive metal and has only been produced in tiny amounts.

Uses of Hassium

Hassium is of research interest only.

Abundance and Isotopes

Abundance earth’s crust: nil

Abundance solar system: parts per billion by weight, parts per trillion by moles

Cost, pure: $ per 100g

Cost, bulk: $ per 100g

Source: Hassium is a synthetic, radioactive metal, created via nuclear bombardment. It has only been produced in minute amounts. Hassium is produced by bombarding 208Pb with 58Fe.

Isotopes: Hassium has 12 isotopes whose half-lives are known, with mass numbers from 263 to 277. None are stable. The most stable isotope is 269Hs, with a half-life of 9.7 seconds.


1. Image by LSDSL

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