What are f-block elements?
The elements in which the differentiating electron (last electron) enters (n-2) f orbital are known as f-block elements. The differentiating electron enters the pre-penultimate shell. The f-block elements are the lanthanides and actinides and are also called inner transition elements. All 28 elements from atomic numbers 58 to 71 and from atomic numbers 90 to 103 are collectively called f-block elements.
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- F-block Elements - General Indroduction