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yesterday in class dr lavelle drew the SO4 2- atom's lewis structure and said that it is most accurate when the central atom (s) has two double bonds and two single bonds, which represents 12 electrons - how does that work?
S has 6 valence electrons so it's allowed to make two double bonds (takes 4 electrons) and two single bonds (takes 2 electrons). You want the central atom to have as few lone pairs as possible for stability purposes, that's why S makes some double bonds too
Lavelle said that elements in the third period and below are able to hold more than 8 valence electrons and stay stable. Since sulfur (S) is in the third period it can follow this rule, which is why it can hold 12 electrons.
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