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Transition Metals


    Transition metals form ions that have multiple charges. Some metals form two different ions, and you must use a roman numeral after the metal to distinguish the charge.

Example: Iron (III) Oxide

Fe+3         O-2
Fe2O3

We know that the transition metal has a charge of positive 3, and we should have already known, from past knowledge, that Oxide, or Oxygen, has a charge of negative 2. Fe+3 and O-2. Now we must take the numbers for a walk. Fe+3  O-2 becomes Fe2O3.


Example: Tin (IV) Iodide

Sn+4        I-1
SnI4

Remember that we do not include the 1, because it is understood to be there, even if we do not write it.


Note: the first element is always a positive!


Roman Numerals 
  • 1 = I
  • 2 = II
  • 3 = III
  • 4 = IV
  • 5 = V
  • 6 = VI
  • 7= VII
  • 8 = VIII
  • 9 = IX
  • 10 = X