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← ScienceWhich outcome results in a Helium atom when the Pauli Exclusion Principle breaks down?
A)Both electrons occupy the 1s orbital✓
B)Increased diamagnetic susceptibility appears
C)Lyman-alpha spectral line is redshifted
D)Atomic radius decreases by threefold
💡 Explanation
When Pauli Exclusion breaks, there is no longer an energy difference requirement; both electrons could occupy the lowest energy 1s orbital because it permits same-spin occupation. Therefore both electrons will violate the normal pairing rules; rather than having opposite spin.
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