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but then it becomes S:6 2O:1*2(sigma) 2O:2*2(pi) 2H:1*2 ---------- 14 but 2pi+4sigma=16 again, it does not work

in this case, since both since are positive you may squares both side so that the abs sign will no longer exist

I tried to use VSERP to draw the shape of H2SO4 but consider S :6 (group6) 4O :2*4 2H :1*2 ----------- 16=>4pi bond but then 4 pi bond of oxygen=16 electrons how about the sigma bond of 2 hydrogen