Transition and Inner Transition Elements — Chemistry STD 12 Science — Question
Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryTransition and Inner Transition Elements2 Marks
Question
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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