In a period the atomic radius ?
Correct answer: B. Decreases
- A. Increases
- B. Decreases
- C. Remain same
- D. First decreases then increases
Explanation
Atomic radius generally decreases from left to right across a period because the nuclear charge increases while added electrons enter the same principal shell. The stronger attraction pulls the electron cloud closer to the nucleus. Students may choose a because they confuse the trend across a period with the increase in atomic radius 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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