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The elements of group VI are: oxygen, sulfur, selenium, tellurium and polonium. The oxygen and sulfur are nonmetals, the metalloids selenium and tellurium are semiconductors, while polonium is a metal. The main features are:

• all are solid at room temperature, except the oxygen and gaseous
• their atoms have six outer electrons, two on a type s orbital, and four out of orbit type p;
• have all the oxidation state of -2 when they bind to the less electronegative. When they bind to electronegative elements are the oxidation states +4 and +6, with the exception of oxygen, this being the second element after elttronegatività fluoride, has a positive oxidation state only when bound to fluorine (and in this case states can take +1 or +2);
• have two pairs of paired electrons, and thus can form two dative bonds with the role of donors; exception of oxygen, which, given its high electronegativity, it does not behave donor, acceptor, but, as an acceptor and can form a single dative bond;
• hydrogen forming compounds which are present in an atom and two hydrogen atoms of the element.

The elements of Group VI A, the group also Ext 16, are called chalcogens, the name has generally been derived from the Greek words chalcos "mineral" and-gen "formation", then the generator of minerals. The compounds, including sulfides, tellurides and the selenuri are also known as chalcogenides.

Oxygen was discovered in 1774 by Joseph Priestley, was known from ancient sulfur, selenium was discovered in 1818 by Jons Jacob Berzelius, tellurium in 1783 by von Mueller Reichestein, and polonium in 1898 by Pierre and Marie Curie.