Three elements X, Y and Z are in the 3rd period. The oxides of X, Y and Z, respectively, are basic, amphoteric and acidic. The correct order of the atomic numbers of X, Y and Z is:

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Strategy:
 The nature of oxides changes from basic to amphoteric to acidic across a period as elements transition from metals to metalloids to non-metals. This corresponds to an increasing atomic number ().

Step 1: Relate oxide nature to Z
In Period 3:
- Basic Oxides: Formed by metals at the beginning of the period (e.g., ). Low atomic number.
- Amphoteric Oxides: Formed by elements in the transition region (e.g., ). Intermediate atomic number.
- Acidic Oxides: Formed by non-metals towards the

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