Oxide Acidity Trend

Question

Acidic character of period 3 oxides increases in which direction?

RankGuru · Accepted Answer

1. **Periodic Trend**: Across a period, the nature of oxides changes from basic to amphoteric to acidic.
2. **Period 3 Sequence**:
   - **Metallic**: $Na_2O$, $MgO$ (Strongly Basic to Basic).
   - **Amphoteric**: $Al_2O_3$ (Reacts with both acids and bases).
   - **Semi-metal/Non-metal**: $SiO_2$ (Weakly Acidic).
   - **Non-metallic**: $P_4O_{10}$, $SO_3$, $Cl_2O_7$ (Acidic to Strongly Acidic).
3. **Conclusion**: Acidic character **increases from left to right**.

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Oxide Acidity Trend

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