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1. Always list the metal first (cation) 2. Follow with the non-metal (anion)

Writing Chemical Formulas. Basic Rules. 1. Always list the metal first (cation) 2. Follow with the non-metal (anion) 3. Polyatomic ions are usually anions except NH 4 +. Mg +2. Cl -. 1. Determine the lowest common multiple (LCM) 2. Divide each Oxidation Number

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1. Always list the metal first (cation) 2. Follow with the non-metal (anion)

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  1. Writing Chemical Formulas Basic Rules 1. Always list the metal first (cation) 2. Follow with the non-metal (anion) 3. Polyatomic ions are usually anions except NH4+

  2. Mg+2 Cl- 1. Determine the lowest common multiple (LCM) 2. Divide each Oxidation Number into the LCM to determine the subscripts MgCl2

  3. Na+ O-2 Mg+2 O-2 Al+3 O-2 Pb+4 O-2 Cr+3 Br-

  4. Na+ P-3 Ca+2 P-3 Al+3 P-3 Pb+4 P-3

  5. polyatomic ions act as a single particle Ca+2 PO4-3 NH4+ Cl-

  6. Nomenclature (naming ionic compounds) 1. Name the metal or cation first. 2. If a binary compound, name the nonmetal (change ending to "ide"). 3. If a polyatomic ion just say its name. 4. If the cation has multiple possible oxidation numbers, then the name of the metal must be followed by a roman numeral indicating the oxidation number.

  7. MgCl2 magnesium chloride CaO calcium oxide Na3P sodium phosphide

  8. NH4I ammonium iodide K3PO4 potassium phosphate Al2(SO4)3 aluminum sulfate

  9. Multiple Oxidation States Fe+2 FeO Fe+3 Fe2O3 iron (II) oxide iron (III) oxide chromium (VI) oxide CrO3 CrO Cr2O3 chromium (II) oxide chromium (III) oxide

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