Which of the following iso-electronic ions would require least energy for the removal of electron?
Correct answer: B. Cl-
- A. Ca2+
- B. Cl-
- C. K+
- D. Ar
Explanation
The correct answer is Cl- because it is an anion with one extra electron compared to its neutral state, reducing the effective nuclear charge per electron and making it easier to remove an electron. In contrast, Ca2+ and K+ are cations that have lost electrons, increasing the effective nuclear charge and making their electrons more tightly bound. Ar has a stable, full electron shell, making its electrons very stable and hard to remove.
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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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