Similar atoms are one group in the periodic system. Chalcogenes are related to oxygen elements Explanation of all the distinctive features can be found only after learning about the structure and properties of the atom. The element differs from related chalcogenes, and water differs from the hydrogen compounds of sulfur, selenium and tellurium. We begin with the characteristics of the entire group of the periodic system, which is headed by oxygen. Let us consider its basic properties, the role innature and economy. The formula for oxygen as a simple substance is O 2. The corresponding decision was made by IUPAC in 1988. According to the new numbering standards, this is the 16th group. The chemical element oxygen is in the secondperiod of the VI-th main group of the obsolete short version of the periodic table.
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