Answer:
![\boxed {\boxed {\sf Ionic \ bond}}](https://img.qammunity.org/2021/formulas/chemistry/high-school/68vgqtyw5iokz61bxpwhxm8gzbhb9vmt47.png)
Step-by-step explanation:
First, let's look at the Periodic Table.
We see that aluminum is a metal, while oxygen is a non-metal.
Now, let's recall three types of bonds
- Ionic: typically forms between a metal and a non-metal
- Covalent: usually forms between non-metals
- Metallic: tends to form with metals
Since we have a metal (Al) and a non-metal (O), aluminum oxide must have an ionic bond.