The order of basic character of given oxides is:
Correct answer: A. Na2O > MgO > Al2O3 > CuO
- A. Na2O > MgO > Al2O3 > CuO
- B. MgO > Al2O3 > CuO > Na2O
- C. Al2O3 > MgO > CuO > Na2O
- D. CuO > Na2O > MgO > Al2O3
Explanation
The basic character of oxides decreases across a period as metallic character decreases. Therefore, Na₂O (most metallic) is the most basic, followed by MgO, then the amphoteric Al₂O₃, and finally the less basic CuO.
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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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