• A polyatomic ion is a group of atoms that are covalently bonded together and which carry an overall electrical charge.
  • The charge of the ion is reflected in the number of total valence electrons in the structure.
  • The Lewis structure for the sulfate ion consists of a central sulfur atom with four single bonds to oxygen atoms.
  • This yields the expected total of 32 electrons.
  • Since the sulfur atom started with six valence electron, two of the S-O bonds are coordinate covalent.
  • The less electronegative sulfur atom is the central atom in the Structure.
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