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← ScienceWhich outcome results when electron shielding fails within heavy metal orbitals?
A)Outer electrons become more relativistic✓
B)Hybridization reduces for inner orbitals
C)Inner electrons become less shielded
D)Orbital energies become nearly degenerate
💡 Explanation
When electron shielding is ineffective, larger nuclear charge increases the velocity of inner electrons, increasing relativistic effects; **relativistic contraction** shrinks the *s* orbitals because of mass increase as velocity increases. Therefore, only s-orbitals are heavily affected, rather than uniform changes to energies.
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