Final answer:
Lanthanides and actinides are part of the f-block elements in the periodic table.
Explanation:
F-block elements include lanthanides and actinides, which are found in the f-block of the periodic table. These elements have their valence electrons in f orbitals. Lanthanides span the elements from Ce to Lu, known as the lanthanide series, while actinides range from Th to Lr, forming the actinide series.
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