In the transition from a one-electron atom to the many-electron interaction in addition to the electron - the core of a new type of interaction - electrons with each other. The interaction of the electron with each other depends on the state of each electron and can not be accurately taken into account, if known wave functions of all the other electrons, which, in turn, can not be calculated, if the unknown interaction of the electron with the rest. It is a vicious circle which makes it impossible to fundamentally solve exactly the Schrödinger equation for many-electron atoms. This difficulty is, fortunately, can be If you get more information, visit our site: BEST ESSAY CHEAP
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