Answer:
Al
Step-by-step explanation:
The overall reaction is
4Al + 3O₂ ⟶ 2Al₂O₃
The Al atoms lose three electrons each to form Al³⁺ ions:
4Al ⟶ 4Al³⁺ +12e⁻
The O₂ molecules gain those 12 electrons each to form O²⁻ ions.
3O₂ + 12e⁻ ⟶ 6O²⁻
The Al³⁺ and O²⁻ ions combine to form Al₂O₃.
4Al³⁺ + 6O²⁻ ⟶ 2Al₂O₃.
