Answer:
Decomposition of aluminium oxide forms aluminium atoms and oxygen atoms.
Step-by-step explanation:
Decomposition reaction:
When a single compound break down into two or more simpler products.
For example "AB" reactant undergoes decomposition to form "A" and "B" products.
The chemical reaction is as follows.
![AB\rightarrow A+B](https://img.qammunity.org/2020/formulas/chemistry/high-school/vy9fuztgh0mbl0iyrbo41ejac3gs3k8nzc.png)
The given compound is aluminium oxide.
The decomposition reaction of aluminium oxide is a follows.
![Al_(2)O_(3)\rightarrow Al+O_(2)](https://img.qammunity.org/2020/formulas/chemistry/college/jlabtb4vqrh1ce5gdvqt33o0lnh94p6ydo.png)
The balanced equation is as follows.
![2Al_(2)O_(3)\rightarrow 4Al+3O_(2)](https://img.qammunity.org/2020/formulas/chemistry/college/gtaivibsyj7fy60vwl7c00v6u306xbl0op.png)
Therefore, Decomposition of aluminium oxide forms aluminium atoms and oxygen atoms.