(Answered) Write down and explain the features in the schroumldinger

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Write down and explain the feature(s) in the Schrödinger equation that lead to the "electron correlation problem". Next, explain the approximation(s) that lead to the introduction of effective nuclear charge (Z Effective). Be sure to define effective nuclear charge in your discussion and explain the role and physical significance of the shielding (screening) constant (s).

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