Shielding effect across the period ________________?
Correct answer: C. Constant
- A. Increases
- B. Decreases
- C. Constant
- D. None
Explanation
Across a period, added electrons enter the same principal shell, so the inner-shell electrons causing most shielding remain almost unchanged; shielding is therefore treated as constant. Students may choose increases because electrons are added across the period, but these new electrons enter the same shell and do not significantly shield one another.
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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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