The order of which the following oxides are arranged according to decreasing basic nature:
Correct answer: A. Na2O, MgO, Al2O3, CuO
- A. Na2O, MgO, Al2O3, CuO
- B. CuO, Al2O3, MgO, Na2O
- C. Al2O3, CuO, MgO, Na2O
- D. CuO, MgO, Na2O, Al2O3
Explanation
In the periodic table, as we move from left to right across a period, the basic character of oxides decreases, while the acidic character increases. This is because metals on the left form basic oxides, while nonmetals on the right form acidic oxides. Sodium oxide (Na2O) is the most basic because sodium is an alkali metal. Magnesium oxide (MgO) is next, being an alkaline earth metal. Aluminum oxide (Al2O3) is amphoteric but less basic than MgO, and copper(II) oxide (CuO), a transition metal oxide, is the least basic. Therefore, option A correctly reflects the decreasing basicity: Na2O, MgO, Al2O3, 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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