Ionization Energy - Chemistry LibreTexts
https://chem.libretexts.org/Bookshelves/General_Chemistry/General_Chemistry_Supplement_(Eames)/Periodic_Trends/Ionization_Energy
WebJun 14, 2023 · Ionization energy is the energy needed to remove an electron from an atom or ion. Unlike atomic radii, we can and do measure ionization energies in the gas phase, when the atom or ion is not interacting with anything else. The first ionization energy, IE 1, is the energy of this reaction. A(g) → A+(g) +e−(g) (1) (1) A ( g) → A + ( g) + e − ( g)
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