Which of the Following Correctly Defines the First Ionization Energy

question 6

Multiple Choice

Which of the following correctly defines the first ionization energy:

• A) A(s) → A⁺(s) + e^-(g); I₁ = E(A⁺, s) - E(A, s)
• B) A(g) → A⁺(g) + e^-(g); I₁ = E(A, g) - E(A⁺, g)
• C) A(g) → A⁺(g) + e^-(g); I₁ = E(A⁺, g) - E(A, g).

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