Choose the least inert gas:
Correct answer: D. Xenon
- A. Helium
- B. Neon
- C. argon
- D. Xenon
Explanation
All of the noble gases are completely inert except for xenon. Under normal conditions, xenon is non-reactive, but at extreme temperatures and pressures, it covalently bonds to fluorine, oxygen, nitrogen, and carbon. Three fluorides of xenon are known: XeF2, XeF4, and XeF6 Although it has a complete outer shell, due to its highly reactive behavior, xenon is considered the least inert gas. Thus, Option 'D' is correct.
This question appeared on the ETEA MDCAT 2011 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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