Ions & Polyatomic Ions
There are two key things you must know: How to find the charge ion ions. The names and formulas for polyatomic ions.
Finding the Ionic Charge for Elements on the Periodic Table
How to find ionic charge on elements using the Periodic Table.
Memorizing the Polyatomic Ions
Memorize the seven most common polyatomic ions and learn to use a table to look up the rest.