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Which of the following ions is smallest in size?

Correct answer: A. F-

  • A. F-
  • B. Cl-
  • C. Br-
  • D. I-

Explanation

The size of an ion generally increases as you move down a group in the periodic table because additional electron shells are added. The fluoride ion (F-) is the smallest in size because it is at the top of the halogen group, with fewer electron shells compared to chloride (Cl-), bromide (Br-), and iodide (I-) ions. Each successive ion has an additional electron shell, making them progressively larger.

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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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