F-block

Elemental Groups

d-block f-block g-block p-block s-block Subgroups actinide lanthanide

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.