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. 2010 Nov 15;13(1):43–52. doi: 10.1038/aja.2010.76

Figure 2.

Figure 2

Oxidation forms of oxygen. If molecular oxygen, which is a diradical with two unpaired electrons, is reduced, it acquires four electrons and water (H2O) is formed. The dashes around the oxygen (O) represent paired, the points represent unpaired electrons.