Question

fill in the correct formula and type of bond for aluminium oxide. a alo ionic b alo covalent c al₂o₃ ionic d al₂o₃ covalent

Explanation:

Step1: Determine ion charges

Aluminum forms $\text{Al}^{3+}$, oxygen forms $\text{O}^{2-}$.

Step2: Balance charges for formula

Cross charges: $2\times\text{Al}^{3+}$ and $3\times\text{O}^{2-}$ give $\text{Al}_2\text{O}_3$.

Step3: Identify bond type

Bond between metal (Al) and nonmetal (O) is ionic.

Answer:

C. $\text{Al}_2\text{O}_3$, ionic