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Some atoms contain D orbitals, and when one uses these orbitals for electrons, the central atom in the lewis structure can have more than an octet. The D orbital allows for the atom to have more than an octet as it can fill electrons in its d orbitals once its s and p orbitals are filled.D orbitals can fit 10 more electrons.
As Dr. Lavelle said in class, the octet rule is better described as the "octet guideline". But for the most part, the elements found in many organic compunds (like carbon, nitrogen, and oxygen) are most stable with a complete octet (8 valence electrons).
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