Question

In which subshell does the last electron enter in the case of Lanthanoids?​

Answer 1

Answer:

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Answer 2

Answer:

According to the Madelung rule, the (n-2)f subshell in f-block elements is filled last, i.e. after the (n-1)p and ns subshells have been filled (if you are not familiar with the Madelung rule, see the page entitled "Electron Shells and Orbitals").

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