A. what are the implied charges on the ions in mg2o3?
Suppose that we have an element A with a charge “a+”, and element B with a charge “b-”. The chemical reaction would be:
A(a+) + B(b-) --> AbBa
So in this case, we can see that:
Mg has a charge of 3+ while O has a charge of 2-.
B. do these charges agree with those expected from trends in the periodic table
From the periodic table, we can see that Mg should only have a charge of 2+ and not 3+.
This might mean that Mg can take different oxidation states.