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Unformatted text preview: 2s electron does not experience the Coulombic potential expected for a positive nuclear charge of 3. Instead, this crude cartoon predicts that the effective nuclear charge is 1, a value not too different from the experimental value. Our non-physical cartoon is qualitatively correct and the 1s electrons do shield the 2s electrons from the full nuclear charge. The experimental value is somewhat greater than one because our cartoon does not accurately reflect the physical situation. The 2s orbital has some small probability of penetrating close to the nucleus. This is evident when we study the radial probability distribution function for the 2s orbital shown here. Since the electron in the 2s orbital is not "always behind" the 1s, the value of Z eff calculated is actually an underestimate.-1-2 +3 2s 1s 2 r...
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This document was uploaded on 03/03/2012.
- Spring '09