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I think it's two shared electrons because in his example SO4 2-, for the oxygen, the equation was FC = 6 - (6 + 2/2) so the numerator in the fraction stands for the number of shared electrons and for SO4 2- the oxygen has a single bond with sulfur so the value of S was 2 since two electrons were shared.
Last edited by Jiyoon_Hwang_2I on Sun Oct 27, 2019 5:30 pm, edited 1 time in total.
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