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Tuesday, 22 May 2018


The elements constituting the f block are those in which the 4f and 5f orbitally progressively filled. These elements are the member of group 3.The f block elements are also termed as inner transition elements. 

It is because literally speaking they constitute transition series within transition series (d-block elements). In addition to incomplete d-sub shell, their f-sub shell is also incomplete.

There are seven f-orbitals in a given shell. As much as fourteen electrons can be occupied in a given f block series. The general electronic configuration of the f block elements is  (n–2)f1–14(n–1)d0–1ns2 .

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