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Understanding Type II Ionic Compounds: Naming and Formula Writing Rules

Type II ionic compounds consist of a metal with a variable charge and a non-metal. Common metals include transition metals like manganese and chromium. The naming rules specify that the cation (metal) is listed first, followed by the anion (non-metal), with Roman numerals to indicate the charge on the metal. For example, CuCl is named copper(I) chloride and CuCl₂ is copper(II) chloride. To determine the charge, use criss-crossing of subscripts. Practice writing formulas and naming compounds to master these concepts.

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Understanding Type II Ionic Compounds: Naming and Formula Writing Rules

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  1. Type II

  2. What is Type II? • Binary (Metal + Non-metal) Ionic Compound • Metal DOES NOT have a fixed charge. • Example: • Most transition metals (except Ag+,Zn2+,Cd2+) • Mn3+ or Mn7+ • Cr2+ or Cr7+

  3. Rules for Naming Type II • Cation (metal) is named first • The name of the cation is just the name of the element. • Denote the charge on the metal using Roman Numerals (I, II, III, IV, V, VI, VII, VIII, IX, X) • Anion (non-metal) is named second • The name of the anion takes the root name of the element with an “ide” ending. • Examples: • CuCl is copper (I) chloride. • CuCl2 is copper (II) chloride.

  4. How do you determine the charge? • Re-criss-cross the subscripts CuCl2 CuCl +2 -1 chloride (II) Copper +1 -1 Copper (I) chloride Practice!!  Cu2S Mn3N

  5. Double check that the charges are correct for those atoms with fixed charges. MnO? • If not, multiply all charges by a common denominator until the fixed charge is correct. MnOMnO • Manganese (II) oxide NOT manganese (I) oxide -1 +1 WRONG!!!! Oxygen has a -2 charge!!!! 1 2 2 1 X2

  6. Nomenclature Practice • FeCl3 • CrO • Mn2O7 • CrN • Mn2S

  7. Rules for Writing Type II Formulas • Determine the charges for both the cation (metal) and the anion (non-metal). The transition metals charge will be given by the use of Roman Numerals. Fe2+ O2- • Criss-Cross the numbers for the charges (WITHOUT the sign) Fe2+ O2- Fe2O2 • Leave off the number “1” because it is understood • Simplify the subscripts FeO

  8. Writing Formulas Practice • Copper (II) sulfide • Iron (I) nitride • Manganese (VII) oxide • Chromium (VI) sulfide • Titanium (IV) bromide

  9. Nebula Gill Sans MT font

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