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Transition and Inner Transition Elements — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryTransition and Inner Transition Elements2 Marks
Question
Why are actinoids called inner transition elements?
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Answer

  • Actinoids are 5f-series elements in which electrons progressively enter into 5f-orbitals, which are inner orbitals.
  • They have electronic configuration $[R n]^{86} 5 f^{1-14} 6 d^{0-1} 7 s^2$.
  • They show intermediate properties as compared to electropositive 5-block elements and electronegative p-block elements. Hence they are called second inner transition elements.

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