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Metals with More than one Cation

Metals with More than one Cation. Page 16. Some Transition Metals can form more than one type of cation . For example, copper can have either a +1 or a +2 charge Iron can have either a +2 or a +3 charge. (see periodic table)

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Metals with More than one Cation

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  1. Metals with More than one Cation Page 16

  2. Some Transition Metals can form more than one type of cation. For example, copper can have either a +1 or a +2 charge • Iron can have either a +2 or a +3 charge. (see periodic table) • The charge of an ion is also called the “combining capacity” or “valence” of the element.

  3. The charge of the metal in a compound is noted in the name with a matching Roman Numeral: • +1 = (I) • +2 = (II) • +3 = (III) • This is called the STOCK system for naming compounds.

  4. Ex. Write the Formula for Copper (I) Sulfide • Charge on Copper ion = +1 or +2 • Since the Roman Numeral shown is (I), the charge to use is +1 • Charge on Sulfur ion = -2 • Cu S • +1 -2 • Criss Crossing gives the formula Cu2S

  5. Ex. Write the Formula for Copper (II) Sulfide • The Roman Numeral (II) means to use the charge of +2 for Copper • The charge for Sulfur is -2 • Cu S • +2 -2 • Equal ratio of charges means the formula is CuS

  6. Write the Formula of the next 5 • Copper (I) Oxide • Cu2O • Lead (IV) Bromide • PbBr4 • Iron (III) Sulfide • Fe2S3 • Nickel (II) Fluoride • NiF2 • Manganese (IV) Sulfide • Mn2S4 MnS2 (must reduce to lowest terms)

  7. Finding the Name of a Compound using the STOCK SYSTEM • Fe Cl3 (Iron can have a charge of either +2 or +3) • Cl has a charge of -1 • Fe Cl3 • ____ - 3 (-1 x 3 = -3) • The charge on Fe must balance with charge on Cl • Since there is One Fe, the charge on it must be +3 • So the iron used is the Fe+3 ion, so use the Roman Numeral (III) in the name: • The name is Iron (III) Chloride

  8. Cu2S • Cu = +1 or +2 • S = -2 • Cu 2 S • _____ - 2 • Since there are 2x Cu, and since the overall charge must = +2, the charge on one Cu must be +1 • The name is Copper (I) Sulfide

  9. 1. Do the white worksheet called “Atoms with More than One Combining Capacity”2. Do the worksheet on page 17 of the pink booklet • Note: • Change #1 (h) to Nickle (II) Chloride • Change #2 (f) to BeF2

  10. Answers to page 17 • 1. Iron (III) Oxide • 2. Lead (IV) Oxide • 3. Nickel (II) Chloride • 4. Chromium (III) Nitride • 5. Mercury (II) Oxide

  11. (II)

  12. BeF2

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