• "Metal + non-metal form ionic bonds" This is not necessarily true. First of all, few bonds are either entirely ionic or entirely covalent. Most bonds are usually more one or the other in character, but few are entirely one or the other. The nature of the bond is determined by the electronegativity of the atoms involved. The greater the difference in electronegativity for the two atoms, the more ionic the nature of the bonds. The smaller the difference in electronegativity, the more covalent the bonds are. With an electronegativity of 1.5, aluminum has a rather high value for a metal. Thus it is form bonds that are more covalent in nature with nonmetals than other metal ions. If you look at other metal ions in that part of the periodic table (, then you will see that they also have similar electronegativities and, therefore, will also form more covalent bonds.

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