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Ionic Nomenclature. Multi- valent metals. Some transition metals are multivalent This means they have more than one ion form Look at the periodic table and locate some multivalent transition metals. What does multivalent mean?. What are multivalent ions?.

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ionic nomenclature

Ionic Nomenclature

Multi-valent metals

what does multivalent mean

Some transition metals are multivalent

  • This means they have more than one ion form
  • Look at the periodic table and locate some multivalent transition metals
What does multivalent mean?
slide3

What are multivalent ions?

For Example: Copper has 2 ion forms

Can be a 1+ or 2+ ion

Copper I Chloride

Copper II Chloride

writing names for multivalent ions

We need to distinguish between the two or three different ion forms

  • Use roman numerals from I – VII which corresponds to 1+ - 7+ ion charges

Metal Ion charge Roman Numeral

1+ I

2+ II

3+ III

4+ IV

5+ V

6+ VI

7+ VII

Writing names for multivalent ions
writing formulas for compounds containing a multivalent metal

For example:

    • Nickel can have two ion forms, Ni2+ and Ni3+
    • These are named nickel (II) and Nickel (III)
  • There will only be 1 multivalent metal in a compound
  • It is the metal so it is first in the name (same as ionic compounds)
  • The roman numeral will indicate which ion form is in the compound
Writing formulas for compounds containing a multivalent metal
steps for writing formulas for multivalent compounds

Step 1: Identify each ion and its charge

  • Step 2: Determine the total charges needed to balance positive and negative
  • Step 3: Note the ratio of positive ions to negative ions
  • Step 4: Use subscripts to write the formula, 1’s are not shown in subscript
Steps for writing formulas for multivalent compounds
try the formula for titanium iv fluoride

Ti4+ and F1-

ions

Total charge to balance

+4 = -1-1-1-1

ratio

1 : 4

Try the formula for titanium (IV) fluoride

formula

TiF4

189-191

criss cross rule a useful trick

Manganese (III) Sulfide

The 3 on the Mn ion becomes the # of S ions

Mn3+ and S2-

ions

Total charge to balance

+3+3 = -2-2-2

ratio

2 : 3

Criss-cross rule: A useful trick

formula

Mn2S3

writing formulas for compounds that contain a multivalent metal

Key Points:

  • The metal is always first
  • The metal is always the positive ion
  • The metal could be a multivalent metal
  • Go to the periodic table and check
Writing formulas for compounds that contain a multivalent metal
now try these

Iron (II) oxide

  • Iron (III) oxide
  • Copper (II) nitride
  • Lead (IV) sulfide
  • FeO
  • Fe2O3
  • Cu3N2
  • PbS2
Now try these:
steps for writing formulas for compounds that contain a multivalent metal

Step 1: Identify a multivalentmetal

  • Step 2: identify its different ion forms
  • Step 3: determine the ratio of ions in the formula
  • Step 4: what is the charge on the negative ion?
  • Step 5: Balance the positive and negative charges
  • Step 6: Write the name using roman numerals in brackets, following the positive ion to indicate which ion was used
Steps for Writing formulas for compounds that contain a multivalent metal
example fei 2

Is there a multivalent metal?

      • Yes, Fe, Iron
  • What are its different ion forms?
      • 3+ and 2+
  • What is the ratio of ions
      • 1 Fe : 2 I
  • What is the charge on the negative ion
      • I, Iodine, ion charge is 1-
      • but there are 2 so the total negative charge is 2-
  • Balance the positive and negative charges
      • Iron must have a 2+ charge to balance the two 1- charges from Iodine
  • Write the name using a roman numeral to say which ion form of Iron is present
      • The negative ion must drop its ending and add –ide (same as ionic compounds)
      • Iron (II) Iodide
Example: FeI2
try another example pbf 4

Pb

  • 2+ and 4+
  • Pb 1: 4 F
  • F’s ion charge 1-
  • Balance the charges
      • 4+ charges to balance the 4 1- charges of F
  • Therefore Pb must be the 4+ ion
  • Lead (IV) Fluoride
Try another example: PbF4
names with multivalent ions

Try it with copper:

CuCl2

CuSO4

Cu2O

CuO

  • Copper (II) chloride
  • Copper (II) sulphate
  • Copper (I) oxide
  • Copper (II) oxide
Names with Multivalent Ions
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