Question

what is the general electronic configuration of F block element

Answer 1

In general the electronic configurationof these elements is (n-1)d1–10 ns1–2. The (n–1) stands for the inner d orbitals which may have one to ten electrons and the outermost ns orbital may have one or two electrons. ... The outer electronic configurations of the transition elements are given in Table 8.1.

Answer 2

Just see
Your question is not correct.....

There is no F block in periodic table.....