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GROUP 2A OXIDES
Group 2A Oxide formation
 Be, Mg, Ca ®   MO   (oxide; O2-)
 Sr, Ba         ®   MO2  (peroxide; O22-)
BeO is an insoluble amphoteric oxide.
All the other 2A oxides are basic and react with water as follows:
 Mg, Ca   MO  +  H2O   ®  M(OH)2 
 Sr, Ba    MO2 + 2H2O  ®  M(OH)2  +  H2O2 
The basicity of these oxides lead to their description as alkaline earth metals.