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Unit 5BCompounds and Their Bonds
Naming and Writing Ionic Formulas
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Charges of Representative Elements
Transition Metals
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What is this rule?
Correct Na+ and Cl- = NaCl
Mg2+ and Cl- = MgCl2
Al3+ and Cl- = AlCl3
Ca2+ and P3- = Ca3P2
Wrong Na+ and Cl- = Na1Cl1
Mg2+ and Cl- = Mg2Cl1
Al3+ and Cl- = Al3Cl1
Ca2+ and P3- = Ca2P3
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Writing Ionic Formulas
Use Swap & Drop to get subscripts
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Ions Formulas
cation anion
Na+ Cl-
K+ S2-
Mg2+ O2-
Ca2+ I-
Al3+ O2-
What is this rule?
Correct Ca2+ and O2- = CaO
Sn4+ and O2- = SnO2
Mg2+ and S2- = MgS
Wrong Ca2+ and O2- = Ca2O2
Sn4+ and O2- = Sn2O4
Mg2+ and S2- = Mg2S2
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Writing Ionic Formulas
Simplify the ratio of subscripts if possible.
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Learning Check – Page 23
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What is this rule?
Correct Iron (III) & O2- = Fe2O3
Tin (II) & Cl- = SnCl2
Copper (II) & F- = CuF2
Wrong Iron (III) & O2- = Fe3O2
Tin (II) & Cl- = Sn2Cl
Copper (II) & F- = Cu2F
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Writing Ionic Formulas
Transition metals can have more than 1 positive charge.
We use Roman numerals to designate the charge.
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Naming Ionic Compounds with Variable Charge Metals
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Learning Check
Write the formulas and names for compounds of the following ions:
Br− S2− N3−
Na+
Al3+
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Naming Variable Charge Metals
Transition metals with two different ions use a Roman numeral after the name of the metal to indicate ionic charge.
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Learning Check
Select the correct name for each.A. Fe2S3
1) iron sulfide 2) iron(II) sulfide 3) iron(III) sulfide
B. CuO 1) copper oxide 2) copper(I) oxide 3) copper(II) oxide
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Solution
Select the correct name for each.
A. Fe2S3
3) iron (III) sulfide Fe3+ S2-
B. CuO
3) copper (II) oxide Cu2+ O2-
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