Addition of a second electron to a uninegative ion is always:
Correct answer: B. Endothermic
- A. Exothermic
- B. Endothermic
- C. Data is insufficient
- D. Unpredictable
Explanation
Adding a second electron to a negatively charged ion (already possessing an excess of electrons) requires overcoming repulsion between the existing electron and the incoming electron. This process consumes energy,making it an endothermic reaction.
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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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