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So elements that count for the expanded octet rule are those in 3p and beyond. I'm not sure it applies to the s and d orbitals because they're usually cations in many cases, but for sure any element in the p orbitals n = 3 and beyond will count for it. I hope this helps!
If you look at it while considering quantum-number theory, then the following statement might help you: elements with an "n" value that equals three or more are capable of having d-orbitals. The expanded-octet rule refers to elements sharing electrons in the d-orbital, and this includes n=elements such as sulfur and phosphorous.
Only elements from the 3rd period and down can have an expanded octet. Because they all have "n" states bigger than 2, which means their "l" states can be s, p, d, or f orbitals, depending on the particular element you're focusing on and what their "n" state is.
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