What are the exemption to Octet rule?

What are the exemption to Octet rule?
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1. Less than the octet Elements B and Be 2. More than the octet Elements from Period 3 and beyond. Since these elements have d orbitals (n=3, therefore they contain an s,p and d), the d orbital can accommodate extra electrons during bonding. 3. Free radicals Molecules with at least one unpaired electron.
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