Predicting Charges

• Transition elements


  Do not have a set valency and as such, their valency can differ
• Roman numerals


  Indicate the valency of transition elements
• Predicting charges of transition elements


  Given the formula, work out the charge of the transition element
• Worked examples


  • Fe₂Os: Fe=3+

  2. CoCl₂: Co=3+
• Determining the charge on an ion

  Work out the negative charge

  1. Metal is always positive
• Determine the charge on:

  • lead ion in PbO: Pb=2+

  1. nickel ion in NiS: Ni=2+
  2. nickel ion in NiBr: Ni=2+
  3. vanadium ion in VS₂: V=3+