There are 3 hydroxide ions bonded to each aluminum ion.
Aluminum belongs to the 13th group of the periodic table. It has 13 electrons in the orbitals. According to the electron distribution rule, there are 3 valence electrons in the aluminum ion.
In the molecule of hydroxide, the oxygen has 5 valence electrons capable of the formation of the double bond. The bonding of the hydroxide ion with the aluminum ion will complete the octet of Aluminum and oxygen by the formation of the double bond.
So Aluminum can form 3 bonds with hydroxide ions. 2 double contributing to 4 electrons and 1 single bond completing the octet of Aluminum.
Thus Aluminum can form 3 bonds with hydroxide ions.
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