Electron filling diagram
1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f ? 6s 6p 6d ? 7s 7p ? 8s ? The order of increasing energy of the sublevels: 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d ? This order corresponds to the order in which the energy sublevels are filled by electrons. nucleus 1s 2s 2p 3s 3p 4s 3d 4p 4d 4f n = 1 n = 2 n = 3 n = 4 Energy level (n) Energy sublevel Increasing Energy
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