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Question

 Al3 O3 + Na OH form Al2NaO2 (for this I understand but why one of the O from Al3O3 did not match with OH to form HO2 instead it form H2O) and water?  I understand that from the question that water is formed but how do I explain that one of the O from Al3O3 goes with OH form one H(hydrogen) and 2 O(oxygen), please enlighten.  
 
If O with 2- in valency electron is criss-cross with H is 1+ in valency electron to get H2O why then Al3 that has 3+ in valency electron was not criss-cross with Na which has 1+ in valency electron in the equation?  I am lost.  Please help.
 
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