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I know it's period 3 elements and on but why? It's something to do with an available d orbital?
Yes, elements in period three and beyond have access to their d-orbitals which allow them to have more than 8 electrons on their valence shell (the d-orbital can hold 10 electrons).
The three scenarios that call for a violation of the octet rule are: an odd number of valence electrons, too few valence electrons, and too many valence electrons. The elements that can form the expanded octet have access to a third energy level, d-orbitals, which allows them to break the rule.
The elements in the third period can have more than 8 electrons because those their atoms have the d orbital its just that it is empty. When they form bonds to have an expanded octet the surplus electrons fill the D orbital.
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