a. Radiation from a sodium lamp, such as a streetlight, appears as yellow light and has a wavelength of 589 nm. A burst of yellow light from the lamp contains 609 kJ of energy.  How many moles of photons are contained in the burst of light?  b. Consider the hydrogen atom with one electron.  Determine the wavelength of the photon emitted when the electron drops from a 4d orbital to a 2p orbital in a hydrogen atom. c. Draw the complete orbital diagram (line and arrows) for Sr2+.  Label all orbitals.  Hint:  it might be useful to first write the full electron configuration, then do the orbital diagram. d. Draw the complete orbital diagram (line and arrows) for Co2+.  Label all orbitals.  Hint:  it might be useful to first write the full electron configuration, then do the orbital diagram.

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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.