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Aufbau Principle

The word aufbau is a Greek word, which means building up. According to this principle, electrons are filled in various orbitals in the increasing order of their energies. For a multi-electron atom, the order is
E1s <  E2s < E2p < E3s < E3p < E4s < E3d < E4p
< E5s < E4d < E5p < E6s < E4f < E5d < E6p
The two representations to remember the above sequence are given

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