Question

why f -block elements are called inner transition elements please do not spam if you don't know ​

Answer 1

The f block elements, numbers 57 to 70 and 89 to 102, are called the inner transition elements because of their placement in the periodic table due to their electron configurations. ... Atoms fill f orbitals that are in principal energy levels that are lower than the outermost electrons.

Explanation:

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Answer 2

In the elements of the lanthanide series and the actinide series the inner f orbital is filled as atomic number increases; those elements are often called the inner transition elements. ... Their variable valence is due to the electrons in the d orbitals.