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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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Get more practice writing formulas for compounds.

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