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Ionic Compounds Pt. 2

Ionic Compounds Pt. 2. Compounds containing Multivalent Metals. Multivalent Metals : can form 2 or more different positive ions with different ion charges Ex.: Iron (Fe) has a charge of 3+ and 2+ The charge that is listed 1 st is the most common

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Ionic Compounds Pt. 2

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  1. Ionic Compounds Pt. 2

  2. Compounds containing Multivalent Metals • Multivalent Metals: can form 2 or more different positive ions with different ion charges Ex.: Iron (Fe) has a charge of 3+ and 2+ • The charge that is listed 1st is the most common So how do you tell the difference between iron 2 and iron 3?

  3. Use Roman Numerals I-VII, which correspond to the ion charges +1 to +7 Examples: • Fe 3+  Fe (III)  said “iron three” • Pb 4+  Pb (IV)  said “lead four”

  4. Formulas of Compounds containing Multivalent Metals

  5. You try! • Chromium (II) chloride • Tin (II) sulphide • Iron (III) phosphide

  6. Chemical Names of Compounds containing Multivalent Metals • You MUSTinclude the Roman Numeral to indicate the ion charge! Steps: • Identify the metal and verify it forms more than one ion • Determine the ratio of ions • Note the charge on the negative ion • The positive and negative charges must balance • Write the name of the compound

  7. You try! • CrBr₂ • MnO • MnS₂

  8. Formulas of Compounds containing Polyatomic Ions

  9. You try! • NaCH₃COO • Ba₃(PO₃)₂ • Sodium Chromate

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