This is a list of cations and anions commonly encountered in 'O' Level Chemistry.
Common Cations
| Name | Formula |
| Aluminum | Al+3 |
| Ammonium | NH4+ |
| Barium | Ba+2 |
| Calcium | Ca+2 |
| Copper(I) | Cu+ |
| Copper(II) | Cu+2 |
| Iron(II) | Fe+2 |
| Iron(III) | Fe+3 |
| Hydrogen | H+ |
| Lead(II) | Pb+2 |
| Magnesium | Mg+2 |
| Potassium | K+ |
| Silver | Ag+ |
| Sodium | Na+ |
| Zinc | Zn+2 |
Common Anions
| Simple ions: | |
| Fluoride | F- |
| Chloride | Cl- |
| Bromide | Br- |
| Iodide | I- |
| Oxide | O2- |
| Sulfide | S2- |
| Hydroxide | OH- |
| Phosphate | PO43- |
| Sulfate | SO42- |
| Nitrate | NO3- |
| Carbonate | CO32- |
| Dichromate | Cr2O72- |
| Permanganate | MnO4- |
Q : Why the name Cations?
A : These ions are Positive in charge, and gather at the Cathode during electrolysis.
Q : Why the name Anions?
A : These ions are Negative in charge, and gather at the Anode during electrolysis.
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