Ionization energy in a period generally ___________________?
Correct answer: A. Increases
- A. Increases
- B. Decreases
- C. No change
- D. Variable trend
Explanation
Ionization energy generally increases across a period as effective nuclear charge increases and atomic radius decreases, making electron removal more difficult. Small exceptions occur, such as between groups 2 and 13 or groups 15 and 16, but they do not change the overall trend. The likely mistake is choosing d because of these exceptions, while the question asks for the general behavior.
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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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