Name the rare halogen among the following.
Correct answer: D. At
- A. F
- B. Cl
- C. I
- D. At
Explanation
Astatine is extremely rare and is considered one of the rarest naturally occurring elements on Earth. It is radioactive element with very short half-lives and thus does not occur naturally.
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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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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