A cartoon view of the synthesis of Hassium

Facts about Hassium:

  • Hassium: Hassium is a synthetic element. Its properties haven't been studied experimentally, but it is expected to behave like Ruthenium and Osmium.
  • Fun fact about Hassium: Hassium is named for the German state Hesse, where researchers worked to prove the existence of this element.
  • Chemical symbol: Hs
  • Atomic number: 108

A crystal structure celebrating Hassium:

The structure of Osmocene - a "sandwich" complex where Osmium(blue) is situated between two 5-membered carbon (grey) rings.

Facts about this structure:

  • Formula: C10 H10 Os
  • Structure name: Osmocene
  • Fun fact about the structure: The 5-membered carbon rings, known as cyclopentadienyl (Cp) rings, adopt the much less common "eclipsed" conformation in Osmocene, as it is believed would occur in Hassocene as well.
  • CSD refcode: SINWER (What's this?)
  • Associated publication: J.C.A.Boeyens, D.C.Levendis, M.I.Bruce, M.L.Williams, J.Crystallogr.Spectrosc.Res. (1986), 16, 519, DOI: 10.1007/BF01161040

More info:

Hassium is a synthetic element with unknown chemical properties, though researchers believe it will behave like Ruthenium and Osmium which sit in the same group in the Periodic Table. The most stable isotope of Hassium has a half-life of 9.7 seconds - which means once it is made, it doesn't last for very long!

More info about the International Year of the Periodic Table (IYPT) in crystals project:

This project (#IYPTCrystals) is part of the International Year of the Periodic Table celebration (#IYPT2019), read more about the project here. You can follow us on social media using #IYPTCrystals and learn more about the wonders of crystals by following the CCDC on Twitter @ccdc_cambridge on Facebook ccdc.cambridge, on Instagram ccdc_cambridge or on YouTube CCDCCambridge.

If you want to find out more about some of the terms and concepts we have a Frequently Asked Questions Page.

A visualisation showing the structure celebrating Hassium alongside other structures published in the same scientific article: