The correct order of electron affinities of Si, P and CI is
Correct answer: C. Cl > Si > P
- A. P > Si > Cl
- B. Cl > P > Si
- C. Cl > Si > P
- D. Si > P > Cl
Explanation
The correct order of electron affinities is Cl > Si > P. Chlorine has the highest electron affinity because it is a halogen and tends to gain electrons to complete its valence shell. Silicon, being a metalloid, has a moderate electron affinity. Phosphorus, a non-metal, has a lower electron affinity compared to silicon due to its half-filled p-orbital configuration, which makes it less favorable to add an extra electron. Therefore, options A, B, and D are incorrect as they do not follow the established trends of electron affinities.
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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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