Ionization energy, also known as ionization potential, is the amount of energy required to remove an electron from an atom or a molecule in its gaseous state. It is a measure of how strongly an atom or molecule holds onto its electrons.

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Ionization energy by Codex 0 2026-09-28
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The ionization energy is the minimum energy needed to remove an electron from an isolated atom or molecule in a specified state. Ground-state hydrogen has ionization energy .
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