Anions
hydroxide cyanide sulfate phosphate sulfide peroxide hydrogencarbonate chlorite
Cations OH- CN- SO42-  PO43-  S2-  O22-  HCO3-  ClO2- 
Ammonium  
NH4+     
Cobalt  
Co2+     
potassium  
K+     
mercurous  
Hg22+     
magnesium  
Mg2+     
cupric  
Cu2+     
ferrous  
Fe2+     
ferric  
Fe3+     
stannic  
Sn4+     
aluminum  
Al3+