The oxides of the elements across period 3, from sodium to sulphur, change from
Correct answer: C. basic through amphoteric to acidic
- A. acidic through amphoteric to basic
- B. acidic to neutral only
- C. basic through amphoteric to acidic
- D. neutral to basic
Explanation
Sodium and magnesium oxides are basic, aluminium oxide is amphoteric and reacts with both acids and alkalis, and the oxides of phosphorus and sulphur are acidic, dissolving to give acids. The change follows the shift from metallic to non metallic character across the period. Identifying aluminium oxide as the amphoteric turning point is the key fact.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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