Which of the following equations represents the first ionisation energy of fluorine?

Which of the following equations represents the first ionisation energy of fluorine? 



A F −(g) → F(g) + e−
B F −(g) → 1/2 F2(g) + e−
C F(g) → F +(g) + e−
D 1/2 F2(g) → F +(g) + e−


Answer: C F(g) → F+(g) + e−


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