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- The elements present in f-block are all metals and are placed in the two rows called lanthanide series (58Ce to 71Lu) and actinide series (90Th to 103Lr).
- The lanthanides are also known as rare earth elements while the actinide elements beyond 92U are called transuranium elements.
- All the transuranium elements are manmade and radioactive.
- The last electron of the elements of these series is filled in the (n-2)f subshell, and therefore, these are called inner transition elements.
- These elements have very similar properties within each series.
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