Answer:
The lanthanide series is characterized by the filling of the 4f subshell, while the actinide series is characterized by the filling of the 5f subshell. Both series are part of the inner transition elements, and their electron configurations involve the incomplete filling of these specific subshells. The lanthanides have atomic numbers ranging from 57 to 71, and the actinides have atomic numbers ranging from 89 to 103.
Step-by-step explanation:
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