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How to Write the Formula for Cobalt (III) chloride

Learning to name chemical compounds requires that you:

  • Determine the type of compound you are working with.
  • Apply the rules for naming that type of compound.
  • Practice until it becomes second nature.
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For Cobalt (III) chloride use the hints and resources below to help write the formula.

Hint for Writing the Formula for Cobalt (III) chloride

Metal (Co) + Non-metal (Cl) = Binary Ionic

But ... Cobalt is a transition metal, so ...

  • Write the element symbols for Cobalt and Chlorine.
  • The (III) tells us that Cobalt has a +3 charge.
  • Use the Periodic Table to find the charge for for Chlorine.
  • Modify the subscript on Chlorine to balance the +3 charge on Cobalt.

Cobalt (III) chloride Resources