Which of the following ions has the highest value of ionic radius?
Correct answer: D. O2-
- A. Li+
- B. B3+
- C. F-
- D. O2-
Explanation
The ionic radius is influenced by the charge on the ion. When an atom loses electrons to form a cation, like Li+ and B3+, the ionic radius decreases because there are fewer electron-electron repulsions and the remaining electrons are drawn closer to the nucleus. Conversely, when an atom gains electrons to form an anion, like F- and O2-, the ionic radius increases due to increased electron-electron repulsion. Among the given ions, O2- has the highest value of ionic radius because it gains two electrons, leading to a more significant increase in size compared to F-, which only gains one electron.
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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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