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What is Aufbau’s principle? How it helps to fill electrons in an atom in different orbitals?

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What is Aufbau’s principle? How it helps to fill electrons in an atom in different orbitals?

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Electrons are filled in orbitals of an atom according to increasing energies which is in accordance to (n+l) values of electrons. If (n+l )values are same the electron goes to orbital having lower value of n. 

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