Which element has the largest number of allotropic forms?
Correct answer: B. Sulphur
- A. Phosphorous
- B. Sulphur
- C. Oxygen
- D. Both A & C
Explanation
Sulphur is the correct answer as it has the largest number of allotropic forms, including rhombic, monoclinic, plastic, and cyclo-octasulphur. In contrast, phosphorus has fewer allotropic forms despite being well-known for them, and oxygen primarily exists as diatomic molecules (O2) with ozone (O3) being its only allotrope, which is significantly fewer than those of sulphur. Therefore, sulphur stands out as the element with the greatest variety of allotropes.
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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