Which of the following is the strongest base?
Correct answer: A. NH3
- A. NH3
- B. PH3
- C. AsH3
- D. SbH3
Explanation
The basicity of hydrides decreases down the group in the periodic table. NH3 (ammonia) is the strongest base among the given options because nitrogen is the smallest and most electronegative element in the group, allowing it to donate its lone pair of electrons more readily. PH3, AsH3, and SbH3 are progressively weaker bases as you move down the group due to the increasing atomic size and decreasing electronegativity, which reduces their ability to donate lone pairs effectively.
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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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