Polonium

**Definition:** A radioactive element that is a member of the chalcogen family. It has the atomic symbol Po, atomic number 84, and the atomic weight of the isotope with the longest half-life (209Po) is 208.98. It decays by alpha-emission.

**Tree numbers:** - D01.268.185.600 - D01.268.271.680 - D01.268.513.875 - D01.496.749.305.680