Shielding effect across the period_________________?
Correct answer: D. Remains constant
- A. Increases
- B. Decreases
- C. Can not be predicted
- D. Remains constant
Explanation
Across a period, added electrons enter the same principal shell, while the number of inner-shell electrons remains nearly unchanged, so the shielding effect remains approximately constant. The likely mistake is choosing increase because electrons are being added, but same-shell electrons shield one another only weakly.
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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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