Which allotropic form of phosphorous is the most stable ?
Correct answer: B. black
- A. White
- B. black
- C. red
- D. Violet
Explanation
Black phosphorus is the most stable allotrope at ordinary temperature because its layered structure has the lowest energy among the common forms. White phosphorus is more reactive, while red and violet phosphorus are less stable than black phosphorus. The likely trap is red phosphorus because it is safer and more stable than white phosphorus, but black phosphorus is the thermodynamically most stable form.
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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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