Custom Search Lewis Dot of Sulfur Trioxide SO3 S does not follow the octet rule. It will hold more than 8 electrons. Sulfur having valence electrons in the 3rd energy level, would also have access to the 3d sublevel, thus allowing for more than 8 electrons. NOT IN THIS MOLECULE. Elements in the first 2 periods of the Periodic Table do not have access to the d sublevel and must adhere to the octet (or duet H and He) rule.
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