Naming Ions (Na+, F-, SO42-...)

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Learning Plan

  1. Watch the video on naming ions.

  2. Review Essential Information on naming ions.

  3. Correctly name ten ions in a row!


Once you get ten in a row, return to the Syllabus or continue to the next section (Formula Writing for Ions).

Essential Information (Naming Ions)

Keys for Single Element Ions (e.g. Na+ , Cl-, ):
  • To name positive ions (called cations) write the name as found on the Periodic Table and add the word 'ion'.
  • For the negative ions (called anions) use the name from the Periodic Table but replace the ending with ‘ide’. Then add the word 'ion' .
For Single Element Ions of Transition Metals
  • Write the ionic charge (the +1, +2 ...) as a Roman Numeral surrounded by parentheses. For example, Fe3+ would be the Iron (III) ion.
  • You'll also want to do this for Pb, Sn as well.
Keys for for Polyatomic Ions (e.g. NO3-,  NH4+):

Video:

Elements or compounds with a + or – charge are called ions.

The + or – charge is because they gained or lost electrons.

Losing an electron makes them positive (cation). Gaining an electron makes them negative (anion).