![Hassium element card: symbol Hs, atomic number 108, atomic mass [269], electron configuration [Rn] 5f¹⁴ 6d⁶ 7s², Transition metal, group 8, period 7.](https://stage.chemistry-dictionary.com/wp-content/uploads/2026/09/hassium-chemical-element.webp)
Hassium is a transition metal located in group 8 of the periodic table. It sits directly below osmium, making it the heaviest element in that specific group. Experiments show that hassium reacts with oxygen to form a highly volatile hassium tetroxide.
The term "volatile" means the compound can turn into a gas very easily. This specific reaction perfectly matches the known chemical behavior of lighter osmium atoms. Scientists produce hassium by shooting light ions at heavy targets like lead or radium.
This high-energy collision inside a particle accelerator fuses the atomic nuclei together. Hassium isotopes have very short half-lives, meaning they decay into other elements very quickly. A half-life is the time required for half of a radioactive substance to decay.
Because of this rapid decay, researchers must use rapid gas-phase chemical techniques. These techniques allow them to capture and analyze single atoms immediately after they form. Theoretical models strongly predict that hassium is a very dense, bright silvery-white metal.
Models also suggest the metal remains completely solid at normal room temperature. Its position in the periodic table heavily influences its basic chemical properties and reactions. Expected relativistic effects also alter the physical shape of its inner electron orbitals. These effects occur because inner electrons move near light speed around a massive nucleus.