the energy of an electron in nth orbit is given by En = -13.6/n2 eV. Calculate the energy required to take an electron from ground state to the 3rd excited state. Share with your friends Share 0 Jyoti Pant answered this The energy of electron in the ground state of hydrogen atom is -13.6 eV.The energy required to take an electron from ground state to the thirs excited state is given by,E3=-[13.642]-[-13.6]=-0.85+13.60=12.75 eV 2 View Full Answer