What is dialuminum trioxide?

Answer 1

There is no such thing as dialuminum trioxide because the combination of 2 aluminums and 3 oxygens creates an IONIC COMPOUND, since it is between a metal and nonmetal, and ionic compounds are not named the same way as binary molecular compounds which is the way it is named in the question. In naming a binary molecular compound you denote each element with the number of each atom in the formula, which was done with " dialuminum trioxide", except this molecule is NOT a binary molecular compound, but an IONIC COMPOUND. To name an ionic compound you simply drop the ending to the least metallic element (oxygen) and add an -ide. So the outcome is ALUMINUM OXIDE.