Jonisation energy of an atom is defined as the energy required to remove an electron from its ground state energy level to its free state.
Ionisation energy for a hydrogen atom is 13.6 eV.
Class 12 Physics
Chapter 12 Atoms Session 2024-2025.
Define ionisation energy. What is its value for a hydrogen atom?
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Ionization energy is the energy required to remove the outermost electron from an atom in its ground state to infinity. For a hydrogen atom, its ionization energy is
13.6eV (electron volts) or 2.18 × 10⁻¹⁸ J.
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