Allotropic form of phosphorus that is poisonous is___________________?
Correct answer: A. White
- A. White
- B. Red
- C. Black
- D. Violet
Explanation
White phosphorus is poisonous because its P4 molecules are highly reactive and can damage tissues; it also ignites readily in air. Red, black and violet phosphorus are much less reactive and substantially safer. The likely trap is red phosphorus, since it is another common allotrope, but red phosphorus is not the poisonous form intended here.
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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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