Which reaction below represents the first ionization of O?
A) O+ (g) + e- ? O(g)
B) O(g) + e- ? O- (g)
C) O- (g) ? O(g) + e-
D) O(g) ? O+ (g) + e-
E) O- (g) + e- ? O2- (g)
Answer: D
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