*Note* Ionic compounds do NOT exist as molecules.
Formulae for ionic compounds.
Group 7 Group 6 Group 5 Group 3 Group 2 Group 1
-1 -2 -3 +3 +2 +1
e.g. Potassium (Group 1) Sulphate (Group 6). {K+ & S2-}
= K2S.
e.g. Caesium (Group 1) Oxide (Group 6). {Cs+ & O2-}
= Cs2O
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Carbonate = CO3 2- Sulphate = SO4 2- Nitrate = NO3 -
Hydroxide = OH- Hydrogen carbonate = HCO3 - Ammonium = NH4 +
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