Polyatomic+Ions

[[http://www.chemistry.wustl.edu/~edudev/LabTutorials/PeriodicProperties/Ions/ions.html|

http://www.chemistry.wustl.edu/~edudev/LabTutorials/PeriodicProperties/Ions/ions.html]]

The only one not listed above is peroxide which is oxygen with a negative 2 charge. And another thing to remember this is 2 oxygen because its a DIATOM.