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Naming Ionic Compounds: Cation and Anion Naming Rules Explained

Understand how to name ionic compounds by identifying the cation (metal) and anion (nonmetal) in the formula. Learn when to use Roman numerals and how to undo the criss-cross method to determine the correct naming convention.

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Naming Ionic Compounds: Cation and Anion Naming Rules Explained

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  1. Naming Ionic Compounds

  2. 1) Name the cation (metal) This one is always first in the formula. 2) Name the anion (nonmetal) **if it is a polyatomic ion write the name **if it is a single element change ending to ide

  3. Examples CaCl2 Calcium chloride Mg(NO3)2 Magnesium nitrate

  4. 3) If the formula has a star by it, then it will have a Roman numeral. To find the Roman numeral, undo the criss-cross. Go to the end of the formula and work backwards

  5. Examples FeCl3 Ask: where did that number, 3, come from? FeCl3 (Work backwards, uncross numbers) example: FeCl3 = Fe3+ Cl- FeCl3 is iron 3+ so the name is iron III chloride

  6. CuNO3 Copper (I) nitrate

  7. Worksheet Fe2S3 Fe+3 S-2 Iron III sulfide

  8. CaBr2 Ca+2 Br-1 Calcium bromide

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