The chalcogens (z) are the chemical elements in group 16 of the periodic table. This group is also known as the oxygen family. It consists of the elements oxygen (O), sulfur (S), selenium (Se), tellurium (Te), and the radioactive element polonium (Po). The synthetic element livermorium (Lv) is predicted to be a chalcogen as well. Often, oxygen is ...
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http://en.wikipedia.org/wiki/Chalcogen
One of the elements in the same column of the periodic table as oxygen. ... (09 Oct 1997) ...
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http://www.encyclo.co.uk/local/20973
chalcogen In inorganic chemistry, a term for any of the elements that are part of Group VIB of the periodic table: oxygen, sulfur, selenium, tellurium, or polonium.
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any of the elements oxygen, sulfur, selenium, tellurium, and polonium, which form the VIa group in the periodic table.
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https://www.infoplease.com/dictionary/chalcogen
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