Answer to Question #86243 in Inorganic Chemistry for Ajay

Question #86243
When electrons are added in the 6s orbital, what happens to the energy level of the 5d orbitals? As a result after the electron enters 5d orbitals in the lanthanum, in which orbital does the next electron enter in cerium?
Expert's answer

So, the orbit in which cells will be filled depends on the energy level and, accordingly, its energy. It can be calculated this way: n + Ln - is principal quantum noL is azimuthal quantum. Thus, the smaller the value n+L, the lower the energy of the sublevel and it will be filled first: for the s-orbitals the value is 0L, for the p-orbitals the value is 1L, for the d-orbitals the value is 2L.

Consider the transition of electrons from one sublevel to another in a cerium atom: on the 6s orbital, the energy value is 6, and on 5d sublevel the energy value is 7. Therefore, as mentioned earlier, first fill up with electrons of the 6s sublevel.

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