What is the energy of a hydrogen atom in the first excited state if the potential energy is taken to be zero in the ground state?

The energy needed to take the hydrogen atom from ground state to the excited state is called excitation energy and hydrogen requires 10.2 eV of energy to get excited from the ground state. As the energy of hydrogen atom in the ground state is 13.6 eV. So, the energy needed to make the hydrogen atom reach the first excited state is,



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