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Redox reactions are characterized by the actual or formal transfer of electrons between chemical species , most often with one species the reducing agent undergoing oxidation losing electrons while another species the oxidizing agent undergoes reduction gains electrons. In other words:. Many reactions in organic chemistry are redox reactions due to changes in oxidation states but without distinct electron transfer. For example, during the combustion of wood with molecular oxygen, the oxidation state of carbon atoms in the wood increases and that of oxygen atoms decreases as carbon dioxide and water are formed.
Sulfur in traditional lay Commonwealth English : sulphur is a chemical element with the symbol S and atomic number It is abundant , multivalent and nonmetallic. Under normal conditions , sulfur atoms form cyclic octatomic molecules with a chemical formula S 8.