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Which mechanism limits complete electron shielding of the nucleus in multi-electron atoms within specific electron orbitals?

A)Angular momentum quantization dictates probability.
B)Heisenberg uncertainty principle broadens locations.
C)Electron spin pairing induces magnetic repulsion.
D)Inter-electron repulsion modifies effective potentials.

💡 Explanation

When multiple electrons occupy an atom, inter-electron repulsion modifies the effective nuclear potential experienced by each electron because the shielding effect of inner electrons is reduced. Therefore, the effective charge is higher, modifying orbital energies, rather than alternatives which are either inaccurate or of secondary importance.

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