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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 atom has the outer electronic configuration of 2S 2 2p 4, with 4 reactive electrons at its outer shell. The molecular oxygen with 0 oxidation state is highly stable due to the participation of each of two electron-pairs donated by the two atoms of oxygen. Thus, the diatomic molecular oxygen contains one sigma- and one pi-bond in its structure.