SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Hassium (Hs). Diagram of the nuclear composition and electron configuration of an atom of hassium-269 (atomic number: 108), the most stable isotope of this radioactive element. The nucleus consists of 108 protons (red) and 161 neutrons (blue). Hassium, named for where it was first synthesised in 1984, is a transactinide and transition metal in group 8, period 7, and the d-block of the periodic table. Hassium-269 has a half-life of 9.7 seconds, its nucleus emitting an alpha particle to form seaborgium-265.
Model release not required. Property release not required.