Transcript Bonding-Nam_writ- transit

Transition Metals
Wtg. Formulas / Nmg. Compounds
• Most transition metals can form ions with
more than one oxidation number.
• Examples: Copper atoms can become
Cu +1 and Cu +2 ions
Iron atoms can become
Fe +2 and Fe +3 ions
Writing Formulas w/Transition Metals
Iron (III) Oxide
• Write the symbol for the transition metal.
Ex. Fe
• Take the oxidation number of the metal,
written in parentheses, and write it as the
oxidation number.
Ex. Fe +3
Writing Formulas w/Transition Metals
Iron (III) Oxide
• Write the symbol for the nonmetal.
Ex. O
• Look up its oxidation number on the
periodic table, and add it to the symbol.
Ex.
O -2
Writing Formulas w/Transition Metals
Fe +3
O –2
• Find the common factor between the two
oxidation numbers. In this case = 6
• Decide how many of each ion is needed to make
the charge equal to the common factor. In this
case 2 Fe and 3 O ions.
• Use this number of ions as the subscript for the
element, and write the formula.
Fe2O3
Copper (I) Sulfide
• Write the symbol for the transition metal.
Ex. Cu
• Take the oxidation number of the metal,
written in parentheses, and write it as the
oxidation number.
Ex. Cu +1
Copper (I) Sulfide
• Write the symbol for the nonmetal.
Ex. S
• Look up its oxidation number on the
periodic table, and add it to the
symbol.
Ex.
S -2
Copper (I) Sulfide
Cu +1
S –2
• Find the common factor between the two
oxidation numbers. In this case = 2
• Decide how many of each ion is needed to make
the charge equal to the common factor. In this
case 2 Cu and 1 S ion.
• Use this number of ions as the subscript for the
element, and write the formula.
Cu2S
Naming Compounds
w/Transition Metals
FeO
• Look up the nonmetal on the periodic table.
Find its oxidation number.
Oxygen O-2
• Look up the metal on your ion chart. Find
the possible oxidation numbers.
Fe +2 or Fe +3
Fe
+2
or Fe
+3
-2
O
• Decide which ion will form in the proper ratio
with the known charge on the oxygen ion.
FeO
• Iron bonds in a 1 to 1 ratio with oxygen, therefore,
the iron ion must have a +2 charge.
• Name the compound, indicating the oxidation
number of the metal in parenthesis.
Iron (II) Oxide
Fe2O3
• Look up the nonmetal on the periodic table.
Find its oxidation number.
Oxygen O-2
• Look up the metal on your ion chart. Find
the possible oxidation numbers.
Fe +2 or Fe +3
Fe2O3
• Decide which ion will form in the proper ratio
with the known charge on the oxygen ion.
Fe +2 or Fe +3
• Iron bonds in a 2 to 3 ratio with oxygen. Three
oxygen atoms will have a charge of -6. Therefore,
two iron ions must equal +6. It must be Fe +3.
• Name the compound, indicating the oxidation
number of the metal in parenthesis.
Iron (III) Oxide