1. Bohr’s Principle
  2. Pauli’s Exclusion Principle
  3. Aufbau Principle
  4. Heisenberg’s Uncertainty Principle
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Option 3 : Aufbau Principle

The rule of placing electrons within shells is known as the Aufbau principle.

It states that ‘orbital of lowest energy is filled first, before the filling of orbital having a higher energy starts’.
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