The Li2+ ion is hydrogenic and has a Lyman series of lines at 740 747 cm-1, 877 924 cm-1, 925 933 cm-1. and beyond. (a) Show that the energy levels are of the form -hcRLi/n2 and find the value of RLi for this ion. (b) Go on to predict the wavenumbers of the two longest wavelength transitions of the Balmer series of the ion and (c) f ind the ionization energy of the ion.

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Quantum Chemistry

Quantum chemistry deals with the properties of chemical systems and their reactions. The branch of chemistry which is more concerned with quantum chemistry is physical chemistry. It is a more sophisticated field of theoretical physics which is concerned towards the application of physical concepts towards various chemical aspects such as, formation of atoms, chemical structure descriptions, chemical bond strength, hybridization, conjugation etc. Quantum chemistry mainly studies the various states i.e., ground state, excited state, transition states of the individual atoms or molecules taking place during any chemical reaction. The laws of motion explained by various scientists, which are termed as “classical mechanics” were not acceptable in terms of electrons, protons, atoms, light etc. Thus, a new theory named “quantum mechanics” emerged to understand the basic framework of various atomic and subatomic particles.