11.The hydrogen atoms are excited to the stationary state designated by the principal quantum number, n = 3. The spectral lines emitted by hydrogen atoms, as explained by Bohrs theory will be

12.In a multi-electron atom the energy of the electron in a particular orbital is determined by

13.The ionization energy of hydrogen atom is 13.6 eV. The third ionization energy of lithium would be

14.An atom has 35 nucleons and has atomic number equal to 17. The number of electrons with n = 2, m = 0 in it is

15.The number of orbitals in the fourth energy level is