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Which of the following reactions gives a positive value for the electron affinity? A) S-(g) +...

Which of the following reactions gives a positive value for the electron affinity? A) S-(g) + e- → S2-(g)
B) O(g) + e- → O-(g)
C) S(g) + e- → S-(g)
D) Br(g) + e- → Br-(g)
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