Answer to Question #66217 in Physical Chemistry for Salman

Question

Due to electron-electron interactions, it is not
possible to obtain exact solutions to the
Schrödinger equation for many-electron atoms.
One approach that addresses this difficulty uses
(A) the rigid-rotor approximation
(B) the harmonic oscillator approximation
(C) the principle of corresponding states
(D) effective nuclear charges
(E) the Franck-Condon principle