Which noble gas is alpha emitter?
Correct answer: B. Radon
- A. Xenon
- B. Radon
- C. Krypton
- D. Argon
Explanation
Radon is the only noble gas with no stable isotope: radon-222 is an alpha emitter with a half-life of about 3.8 days, produced in the uranium decay chain. Xenon, krypton and argon occur naturally as stable gases.
This question appeared on the UHS MDCAT 2017 paper, which you can sit online with every answer explained.
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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