The ionization energy__________________?
Correct answer: A. Generally increases from left to right in a period
- A. Generally increases from left to right in a period
- B. Does not change in a period
- C. Increase from top to bottom in a group
- D. Does not change in a group
Explanation
Ionization energy generally increases from left to right across a period because effective nuclear charge increases and the outer electron is held more strongly. There are small exceptions, such as between groups 2 and 13 or groups 15 and 16, but the overall trend is an increase. Students may choose c by confusing ionization energy with atomic radius, which increases down a group.
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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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