F-block

F-block (for fundamental) elements consist of the lanthanide and actinide
series. They have two s-electrons in their outer (n) electron shell and
f-electrons in their inner (n-2) shell. Some also have d-electrons in their
semi-inner (n-1) shell.

Other blocks:

   * d-block
   * g-block
   * p-block
   * s-block

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