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Why is the second electron affinity value of oxygen positive?
Interesting. Can you explain why some elements have a positive electron affinity while others have a negative electron affinity?
Sure! The electron affinity of an element depends on various factors including its atomic structure and the energy required to add an electron. If the atom's electron configuration is already stable and the added electron would create repulsion, then the electron affinity will be positive. But if the added electron would complete the atom's electron configuration and make it more stable, then the electron affinity will be negative.