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How to Write the Formula for Iron (III) phosphide

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 Iron (III) phosphide use the hints and resources below to help write the formula.

Hint for Writing the Formula for Iron (III) phosphide

Metal (Iron) + Non-metal (Phosphorus) = Binary Ionic

Iron is a transition metal, so ...

  • Write the element symbols for Iron and Phosphorus.
  • The (III) tells us that Iron has a +3 charge.
  • Use the Periodic Table to find the charge for for Phosphorus.
  • Check the ionic charges to see if they balance.

Iron (III) phosphide Resources