Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Diatomic carbon is a diatomic molecule of carbon, which occurs when in an electric arc, in comets, and in the blue light we see in flames. Valence bond theory predicts a quadruple bond as the only way to satisfy the octet rule for carbon. However, molecular orbital theory shows that there are two sets of paired electrons in the sigma system, and two sets of paired electrons in a degenerate pi bonding set of orbitals.

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