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In addition, groups may be idenitifed by the first element in each group-so the Group 16 elements is sometimes called the oxygen group. There is considerable confusion surrounding the Group labels.
Oxygen is the second most electronegative atom, so it is usually assigned the bonding electrons. However, it is not â2 when it is elemental O 2 (Rule 1) or bonds to F (Rule 2). In addition, it can be â1 if Rules 3 and 4 force it. Compounds in which the oxidation state of oxygen is â1 are called peroxides.