Which mechanism limits electron density between atoms during sigma bond formation in molecular orbital theory?

💡 Explanation

Applying the Pauli exclusion principle limits electron density because only two electrons with opposite spins can occupy a single spatial orbital, reducing constructive interference and bond order increase. Therefore restricted electron density results from Pauli exclusion, rather than Hund's rule, Heisenberg principle, or Aufbau principle which address different electronic properties.

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