Ionization energy (I. E.) is the energy required to remove an electron from a gaseous atom or ion.
• First I.E. corresponds to removing the first valence electron from a neutral atom
• Second I.E. refers to removing a second electron
• Third I.E. refers to removing a third electron.
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) + e- → O2-(g)
e. O-(g) → O(g) + e-
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