If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required t

If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of Li⁺⁺ is? ans is 30.6 eV

how?

Re:If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required t