Which of the following has least tendency to form unipositive ions in the gaseous state?
Correct answer: D. F
- A. I
- B. Cl
- C. Br
- D. F
Explanation
Fluorine (F) is the most electronegative element in the periodic table, which means it has a strong tendency to gain electrons rather than lose them. This makes it the least likely to form unipositive ions in the gaseous state compared to the other halogens listed. Iodine (I), Chlorine (Cl), and Bromine (Br), while also electronegative, have a lower electronegativity compared to fluorine, making them more likely than fluorine to lose an electron and form a positive ion.
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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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