sentence: Polonium is radioactive.
sentences_before: Group 16' is the third last group in the periodic table. This group is called the 'oxygen family' or the 'chalcogens'. The elements in this group are oxygen, sulfur, selenium, tellurium and polonium. The first three elements are nonmetals and the last two are semimetals.
sentences_after: Oxygen is a colorless gas.
concept_name: polonium
headings: Group 16 element
categories: Chemical elements Periodic table