Which of the following has largest ionic radius?
Correct answer: B. Na+
- A. Li+
- B. Na+
- C. Mg2+
Explanation
The ionic radius is determined by the balance between the number of electron shells and the effective nuclear charge. In this case, Na+ has the largest ionic radius among the options because it has more electron shells than Li+, despite having the same charge. Mg2+ is smaller than Na+ due to its higher positive charge, which increases the effective nuclear charge and pulls the electrons closer, reducing its radius. Thus, Na+ is the correct answer.
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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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