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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.
Construct a Molecular orbital diagram for the O 2 molecule. There are six valence electrons on a neutral oxygen atom and therefore 12 valence electrons in an O 2 molecule. These electrons are added to the diagram in the figure below, one at a time, starting with the lowest energy molecular orbital.