The ionization energy of a hydrogen atom is 13.6 eV. What is the energy required to remove an electron from n = 3 to inf
E₃ = -13.6×16/9 = -24.18 eV. IE = 24.18 eV.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Electronic Configuration - Aufbau Pauli Hund and Stability