Explain dinitrogen tetroxide and magnesium fluoride

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Which of these names and formulae do NOT match correctly. 1. N2O4 : dinitrogen tetroxide 2. MgF2 : magnesium ?uoride 3. HgCl : mercury (II) chloride 4. SF6 : sulfur hexa?uoride 5. Fe(NO3)3 : iron (III) nitrate

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