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 the third electron
The first two ionization energies of nickel. Express your answer as a chemical equation separated by a comma. Identify all of the phases in your answer.
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