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- Do atoms in excited states emit radiation randomly, at any wavelength? Why? What does it mean to say that the hydrogen atom has only certain discrete energy levels available? How do we know this? Why was the quantization of energy levels surprising to scientists when it was first discovered?How would you explain the role of electron correlation in the accurate determination of molecular properties, and what is the significance of this correlation in quantum chemistry calculations?a) what is meant by the term polarizability? (b) Which of the following atoms would you expect to be most polarizable: O, S, Se, or Te? Explain.
- What is the difference between functional magnetic resonance, electron paramagnetic resonance and nuclear paramagnetic resonance?Define the term electron domain?Why are the observed configurations of, for example, trigonal bipyramidal structures sometimes different for different measuring techniques?
- Why is the electronic configuration of the yttrium atom [Kr]4d15s2 and that of the silver atom [Kr]4d105s1?Predict the ground state electronic configurations of CF, CH, CH+, and CN-. Do any of them have unpaired electrons?Write down the uncondensed electronic configurations for Co;; Co2+ and Co3+. In the case of the Co2+, which orbital is losing electrons? Why is this the case?
- how will the density of the dν/dE levels of the energy spectrum of free electrons change and by how many times with an increase in the number of N atoms forming a crystal by n timesTwo lasers generate radiation of (1) 9.5 µm and (2) 0.1 µm respectively.(a) For each of the radiations, determine the photon energy (in eV).(b) Will either of the two radiations be able to break (dissociate) the Si–H bondin SiH4? Given: ESi-Si = 180 kJ/moleEH-H = 435 kJ/moleFor multi-electron atoms, we use the shell model and effective corepotential to estimate the energy of each atomic orbitals.a) For carbon anion (C-1), estimate the energy of 1s and 2s atomic orbitals.b) Draw the energy level diagram and assign electrons for carbon anion(C-1).c) In one or two sentences, briefly describe what is the physical meaningof atomic orbitals.d) Lydia sets up a photoelectron spectroscopy experiment of the gaseouscarbon anion (C-1) using an UV light (λ = 300 nm). How many peaks do you expect to see in the final spectrum?e) Estimate the lowest kinetic energy of the ejected electrons.
