The statements
$i$. In filling a group of orbitals of equal energy,it is energetically preferable to assign electrons to empty orbitals rather than pair them into a particular orbital.
$ii$. When two electrons are placed in two different orbitals,energy is lower if the spins are parallel.
Are valid for

  • A
    Aufbau principle
  • B
    Hund's rule
  • C
    Pauli's exclusion principle
  • D
    Uncertainty principle

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