Shielding

Shielding - 5 10 15 20 25 30 0.2 0.4 0.6 0.8 1 r (nm) 4 π...

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Shielding: Effective Nuclear Charge Model He: Electron-Electron Repulsion e - r 2 e - r 2 Z eff 1 r 2 0 Z eff 2 Ψ 1 (r 1 ) = N e –Z eff r 1 /a o Ψ 2 (r 2 ) = N e –Z eff r 2 /a o E = E 1 + E 2 E = -13.6eV Z 2 eff 1 n 2 1 + 1 n 2 2 E exp = -79 eV Z eff = 1.7 Z eff = Z – point charge at the nucleus representing the average electron-electron repulsion Each successive shell is shielded to a greater extent by previous shells.
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Unformatted text preview: 5 10 15 20 25 30 0.2 0.4 0.6 0.8 1 r (nm) 4 π r 2 R(r) Orbitals with low l penetrate more and are then less easily shielded by other electrons. Electrons in the same subshell don't shield each other well, because they have the same average radius....
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