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MHT CET202526 Apr 2025Evening ShiftChemistryStructure of AtomActual

"Pairing of electrons in the orbitals belonging to the same subshell does not occur unless each orbital belonging to that subshell has got one electron each." This statement is known as

Options

  1. APauli's exclusion principle
  2. BHund's rule
  3. CAufbau rule
  4. DHeisenberg uncertainty principle

Correct answer

B. Hund's rule

Step-by-step solution

The statement "Pairing of electrons in the orbitals belonging to the same subshell does not occur unless each orbital belonging to that subshell has got one electron each" constitutes the definition of Hund's rule of maximum multiplicity. This posited rule mandates that, within degenerate orbitals of a given subshell, each orbital is occupied by a single electron possessing parallel spin prior to any electron pairing occurring, thereby maximizing unpaired electrons and minimizing inter-electronic repulsion. Among t

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