Actual structure: S is connected to O1 via double bond (2 bonds), to O2 via double bond (2 bonds), to O3 via single bond (1 bond), to O4 via single bond (1 bond). Total bonds around S = 2+2+1+1 = 6 bonds? That can’t be—sulfur can’t form 6 bonds. Mist!
Oxygen is highly electronegative and demands a full octet (8 electrons). Currently, each oxygen atom is bonded to sulfur with one single bond, meaning each oxygen has 2 electrons. They need 6 more each. lewis dot structure of so4