Metal + O₂ usually yields a:

The reaction between a metal and oxygen ($O_2$) produces a metal oxide. 1. **General Reaction:** Most metals react with oxygen to form metal oxides according to the equation: $$2M + O_2 \rightarrow 2MO$$ 2. **Chemical Nature:** Metal oxides are generally **basic** in nature. This is because they react with water to form metal hydroxides (bases) or react with acids to form salt and water. For example: $$MgO + H_2O \rightarrow Mg(OH)_2 \text{ (Basic)}$$ 3. **Comparison:** In contrast, non-metals typically react with oxygen to form acidic or neutral oxides. For instance, $S + O_2 \rightarrow SO_2$, which is acidic.