What are fIrst inner transition elements? - Vidyadip

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What are fIrst inner transition elements?

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Answer

4f-hlock elements are called (first) inner transition elements and have partly filled inner orbitaIs or (4f) orbitais.
They have general outer electronic configuration $(n-2) f^{1-14},(n-1) d^{0-1}, n s^2$.
There are two f-series, namely 4f and 5f series, called lanthanoids and acùnoids respectively.
They shos intermediate properties as compared to electropositive s-block elements and electronegative p-block elements. Hence they are called (first) inner transition elements.

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