Uni-negative ion formation means an atom gains one electron to form a single negative ion (anion). This process releases energy (called electron affinity), so it is exothermic.
Which of the following ion formation is always exothermic?
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Question context
This question is part of 🧬 Biochemistry within the broader 🧬 Medical Science subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.