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Writing Ionic Formulas

Writing Ionic Formulas. Criss-Cross Method. Mg +2 and Cl -1. Crisscross and Drop. Mg 1 Cl 2 but if subscript is 1, forget it!. MgCl 2 means 1 Mg +2 and 2 Cl -1. NOTE: The formula has to be in the simplest whole number ratio (this is called the empirical formular. Be 2 O 2 = BeO

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Writing Ionic Formulas

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  1. Writing Ionic Formulas

  2. Criss-Cross Method Mg+2 and Cl-1 Crisscross and Drop Mg1Cl2 but if subscript is 1, forget it! MgCl2 means 1 Mg+2 and 2 Cl-1

  3. NOTE: The formula has to be in the simplest whole number ratio (this is called the empirical formular Be2O2 = BeO Al3N3 = AlN

  4. Try a few formulas: CaCl2 • Ca+2 + Cl-1 • Na+1 + O-2 • Cs+1 + S-2 • Al+3 + Cl-1 • Al+3 + Se-2 • Mg+2 + F-1 • Ca+2 + S-2 Na2O Cs2S AlCl3 Al2Se3 MgF2 CaS

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