Chalcogen
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The chalcogens are the chemical elements in group 16 of the periodic table. This group is also known as the oxygen family. Group 16 consists of the elements oxygen, sulfur, selenium, tellurium, and th
The four stable chalcogens at STP
Water (H2O) is the most familiar chalcogen-containing compound.
Johann Wolfgang Döbereiner was among the first to notice similarities between what are now known as chalcogens.
Sulfur recovered from oil refining in Alberta, stockpiled for shipment in North Vancouver, British Columbia
Polonium
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Polonium is a chemical element; it has symbol Po and atomic number 84. A rare and highly radioactive metal with no stable isotopes, polonium is a chalcogen and chemically similar to selenium and tellu
Chalcogen
…also known as the oxygen family. Group 16 consists of the elements oxygen (O), sulfur (S), selenium (Se), tellurium (Te), and the radioactive elements polonium (Po) and livermorium (Lv). Often, oxygen is treated separately from the other chalcogens, sometimes even excluded from the scope of the term "chalcogen…
Polonium on brass sheet
The alpha form of solid polonium