Addition of 2nd electron to a uni negative ion is always____________________?
Correct answer: B. Endothermic
- A. Exothermic
- B. Endothermic
- C. Data is insufficient
- D. Unpredictable
Explanation
Adding a second electron to a uninegative ion is endothermic because the incoming electron is repelled by the already negative ion, so energy must be supplied. Students may choose a by assuming every electron addition releases energy, but that is mainly true for the first electron added to a neutral atom.
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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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