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  1. Heisenberg uncertainty principle
  2. Hund’s rule
  3. Aufbau principle
  4. Pauli’s exclusion principle
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Option 3 : Aufbau principle

The order of filling up of an atom's orbitals is governed by the Aufbau principle. It states that in the ground state of an atom/ion, the electrons fill atomic orbitals of the lowest available energy level before occupying higher levels.
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Related Questions

Statement: Syrian President Bashar al-Assad has revealed during an interview that a direct clash between the US and Russia in Syria was narrowly avoided "by the wisdom of the Russian leadership".  Which of the following objection(s) might be a probable reason(s) for such a revelation by Syrian President Bashar al-Assad I. Adding that Syria needs Russian support, Assad said, "At the same time we need to avoid the American foolishness in order to be able to stabilise our country". II. Adding that Syria needs American support, Assad said, "At the same time we need to avoid the American foolishness in order to be able to stabilise our country". III. Adding that Syria needs Russian support, Assad said, "At the same time we need to avoid the Russian foolishness in order to be able to stabilise our country". IV. Adding that Syria needs American support, Assad said, "At the same time we need to avoid the Russian foolishness in order to be able to stabilise our country".?
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