Among the halogens the rare element is________________?
Correct answer: C. Astatine
- A. Fluorine
- B. Chlorine
- C. Astatine
- D. Iodine
Explanation
Astatine is the rarest naturally occurring halogen because it is radioactive and has no long-lived stable isotope, so only trace amounts occur in nature. Fluorine may be chosen because it is less abundant than chlorine, bromine, or iodine in some contexts, but astatine is far rarer.
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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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