Formula of Ions
- Ionic compounds made up of positive ions and negative ions.
- To write the formula of an ionic compound, we need to know the symbol and charge of the ions in the compound.
Positive ions that you need to know in SPM form 4 chemistry:
|
Ion |
Symbol |
Ion |
Symbol |
| Potassium |
K+ |
Calcium |
Ca2+ |
| Sodium |
Na+ |
Magnesium |
Mg2+ |
| Lithium |
Li+ |
Zinc |
Zn2+ |
| Hydrogen |
H+ |
Barium |
Ba2+ |
| Argentums(I) |
Ag+ |
Iron (II) |
Fe2+ |
| Mercury(I) |
Hg+ |
Tin (II) |
Sn2+ |
| Ammonium |
NH4+ |
Lead(II) |
Pb2+ |
| Aluminium | Al3+ | Copper(II) |
Cu2+ |
| Iron (III) | Fe3+ | Manganese(II) |
Mn2+ |
Negative ions that you need to know in SPM form 4 Chemistry
|
Sulphate |
Carbonate |
Nitrate |
Hydroxide |
|
SO42- |
CO32- | NO3– | OH– |
|
Fluoride |
Chloride |
Bromide |
Iodide |
Oxide |
|
F– |
Cl– |
Br– |
I– |
O2- |
| Phosphate | PO43- |
| Ethanoat | CH3COO– |
| Manganate(VII) | MnO4– |
| Dichromate(VI) | Cr2O72- |
| Thiosulphate | S2O32- |
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