Chloride ions and argon atoms are isoelectronic, i.e., they have the same number of electrons and identical electron configurations. Would you predict that they are the same size or is one larger than the other? Explain your answer.

We enphasized that the Bohr Planetary Model along with the Balmer equation provides precisely correct answers only for hydrogen and other elements, such as Li+2, with only a single electron.  In a single sentence, identify a property in a multi-electron atom that may be responsible for the failure of the Balmer equation to correctly predict the energy of electrons.

16) In qualitative terms, how does Bohr's model account for the atomic spectrum of hydrogen? More than one selection may be correct. a) When a hydrogen atom absorbs energy, as it does when an electric discharge passes through it, the electron stays in the orbit having n = 1. b) The energy released when an electron drops from a higher to lower orbit appears as a photon with the appropriate frequency. c) The energy released when an electron drops from a higher to lower orbit appears as a photon with energy equal to the energy difference between the two orbits. d) Electrons are found in orbits of arbitrary energy. e) The energy released when an electron drops from a higher to lower orbit appears as a photon with an arbitrary frequency. f) Electron moves around the nucleus along orbits. g) When a hydrogen atom absorbs energy, as it does when an electric discharge passes through it, the electron is raised from the orbit having n = 1 to a higher orbit, to n = 2 or n = 3 or even higher.

22. Using the Bohr model, determine the energy of an electron with n = 6 in a hydrogen atom.