An international collaboration led by a research group from GSI/FAIR in Darmstadt, Germany, has achieved the first measurement of the chemical stability of a superheavy element compound. The focus was on the hexacarbonyl complex Sg(CO)₆ of seaborgium (Sg, element 106). The result: The bond between the seaborgium atom and a carbonyl ligand is weaker than expected based on its position in the periodic table. Relativistic effects are the cause. The results are published in the journal Nature.