Which of the following is most basic?
Correct answer: C. Ba(OH)2
- A. Mg(OH)2
- B. Ca(OH)2
- C. Ba(OH)2
- D. Sr(OH)2
Explanation
In the periodic table, basicity of hydroxides increases as you move down Group 2. This is because the hydroxides of heavier alkaline earth metals dissociate more completely in water. Barium hydroxide, Ba(OH)2, is the most basic among the given hydroxides as barium is the heaviest element listed. Mg(OH)2 is the least basic due to magnesium's position higher up in the group, which results in a less ionic compound.
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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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