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Which outcome prevents electron promotion in stable noble gases?

A)High ionization energy threshold
B)Sufficient nuclear shielding effect
C)Significant electron spin coupling
D)Zero permanent dipole moment

💡 Explanation

High ionization energy prevents electron promotion from filled valence orbitals, because *ionization energy* is the energy required to remove an electron; therefore, energy is insufficient to permit electron excitation, rather than spin coupling determining stability.

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