A. Briefly explain how orbital energies in multi-electron atoms differ from orbi

Question

A. Briefly explain how orbital energies in multi-electron atoms differ from orbital energies in the hydrogen atom.

B. Write the ground-state, electron configurations of helium, neon, and argon.

C. How do your answers to A and B explain why there is one signal for He, three signals for Ne, and five signals for argon?

D. Given that 1 electron volt (eV) corresponds to exactly 1.602 x 10-19 J and the ionization energies of He, Ne, and Ar in your text (in kJ/mol), indicate which peaks in the PES spectra correspond with the first ionization energies of He, Ne, and Ar. (Hint: You will need to convert the eV to J, then to kJ, and multiply by Avogadro's Number to get kJ/mol units).

E. Identify the locations of the 1s orbitals for He, Ne, and Ar. Does it require the same amount of energy to remove an electron from a 1s orbital, regardless of the element to which it belongs? Please explain

Explanation / Answer

Multiple questions. Please split the rest of the parts.

A. In multi-electron systems , electron electron repulsion occurs which is not present in single electron systems. Due to this there is an additional interaction term in the Hamiltonian of the system which is difficult ot account for while deriving solutions.

B.

He - 1s2

Ne - 1s2 2s2 2p6

Ar - 1s2 2s2 2p6 3s2 3p6

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