Aufbau principle

Aufbau principle: According to this principle, the electrons enter the various orbitals in the order of increasing energy. This means that electrons occupy the lowest orbital first and then the orbitals of next higher energy and so on. The different orbitals are filled up in the following order as given below.

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p.



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