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As the first person mentioned, the Lewis Structure for resonance does not always have a octet rule. Of course, as we always say, Hydrogen, Helium, lithium, and Beryllium does not have octet rule but it has duet rule. Other certain structures does have a different types of rules as well such that some holds more then 8 valence electrons.
Generally, the octet rule will be followed for lewis structures that have resonance. However, as someone mentioned above, some atoms can form more than four bonds because they are big enough and have the ability to fill the d orbitals. This only starts after the 3 p level though, and so some atoms in this level or more can form more than four bonds or have additional lone pairs on the atom.
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