Question

Why f block elements are known as inner transition elements?

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. ... Thus, the electron configuration for Nd (Z=60) is [Xe] 6s2 4f4. The last electron goes into a 4f orbital which is inside the 6s orbital

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Answer 2

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.

If the periodic table were expanded beyond its usual layout to include the f block elements, it would look like this:




The table is rarely displayed this way because of the space it would need.  

Atoms fill f orbitals that are in principal energy levels that are lower than the outermost electrons.  Thus, the electron configuration for Nd (Z=60) is [Xe] 6s2 4f4.  The last electron goes into a 4f orbital which is inside the 6s orbital.