Not all polyatomic Ions have a charge of 2-, such as hydroxide and ammonium which have charges of 1- and 1+ respectively. Sulfate (SO4^2-) is a polyatomic anion used in many salts, acid derivatives, and peroxides. The symmetry is the same as that of methane. The formal charges will depend on the manner in which the Lewis dot diagram is drawn. And since you know that the over all has to be a -2 you can deduce that sulfur must be +6. Formal charge is a system for bookkeeping electrons in which it is assumed that all shared electrons are shared equally. For the poly you have to remember the charge otherwise you can't figure it out. Fluorine (F), on the other hand, has a high electronegativity and easily picks up extra electrons. Roman numeral notation indicates charge of ion when element commonly forms more than one ion. You know Oxygen has -2 charge, but you have 4 so -2 x 4 = -8. Anions 1- acetate C 2H 3O 2-cyanide CN- amide NH 2-cyanate OCN-hydrogen carbonate fluoride F- (bicarbonate) HCO 3-hydride H- hydrogen sulfate hydroxide OH-(bisulfate) HSO 4 MnO4 if you don't know the charge -1 on it how you know the Mn is +7. This program was created with a lot of help from: The book "Parsing Techniques - A Practical Guide" (IMHO, one of the best computer science books ever written. Sulphate Structure [SO 4 2-]. The pure acids have no charge - only their consitutent ions have charges when the acids are mixed with water. For example, iron(II) has a 2+ charge; iron(III) a 3+ charge. You probably know H2SO4, sulfuric acid, which as a molecule, has no charge. H2SO4 means the SO4 has a 2- charge, H3PO4 means the PO4 has a 3 minus charge Having said all that, H2SO4, sulphuric acid, is a balanced molecule and has no charge - same with phosphoric acid. and since the two H+ which together would have a valence of 2+ bond with the SO4, the SO4 would have to have a valence of 2- to equal out the charge. Structure, properties, spectra, suppliers and links for: Cobalt(II) sulfate, 10124-43-3, 139939-65-4. "Sulfate" is the spelling recommended by IUPAC, but "sulphate" was traditionally used in British English.. what is the formal charge on each atom in a SO4 molecule. Ions that have a negative charge are called anions, and positively ch The formal charge of the sulfate ion, which has the molecular formula (SO4)2-, is -2. ); The Gold Parsing System (Hats off! Structure. The charge of the sulfate ion SO4 is -2. In the case of sodium, sodium normally loses 1 electron and so forms an ion with a charge of +1, written Na +. 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