The ground state energy of hydrogen atom is -13.6 eV . When its electron is in the first excited state, its excitation energy is

Step-by-step solution

Key Idea : Excitation energy is defined as the energy required to take the electron from ground level orbit to any higher order orbit (ie, n=2,3,4 ) . Given, ground state energy of hydrogen atom E₁=-13.6 eV Energy of electron in first excited state (ie, n=2 ) E₂=- 13.6 (2)^2 eV Therefore, excitation energy aligned E & =E₂-E₁ & =- 13.6 4 -(-13.6) & =-3.4+13.6=10.2 eV aligned