a single electron orbit around a stationary nucleus of +Ze where Z is a constant and e is the magnitude of electronic charge. it requires 47.2eV to exit the electron from the 2nd bohr orbit to the 3rd. find (i) the value of Z. (ii) the energy require to excite the electron from the 3rd to the 4th orbit. (iii) the wavelength of the electromagnetic radiation require to remove the electron from 1st bohr orbit to infinity. (iv) the K.E, P.E and the angular momentum of the electron in the 1st orbit. (v) the radius of the bohr orbit