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i don't know whether there exists Alo,all i study so far is Al2O3
both MgO and Al2O3 are ionic compouds. Al3+ is smaller than Mg2+(due to higher proton charge thus attracts the electrons closer),thus the ionic bonds in Al2O3 is greater thus it is harder.

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Q: Is hardness of MgO is greater than Alo?
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