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For the octet expansion exceptions I know it starts with period 3 but does it start with aluminum or does it start with phosphorus? I have conflicting notes from different UA sessions for some reason. Also, if it starts with phosphorus, do aluminum have a different exception? Thank you!
I believe it starts at the beginning of the p group of period 3 with aluminum because silicon can have an expanded octet. In aluminum's case though, while I think it could potentially have an expanded octet, like Boron it can function well with 6 electrons so often has a reduced one.
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