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Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryClassification of Elements and Periodicity in Properties1 Mark
MCQ
The elements in which electrons are progressively filled in $\ce{4f}-$ orbital are called :
  • A
    Actinoids.
  • B
    Transition elements.
  • ✓
    Lanthanoids.
  • D
    Halogens.
✓

Answer

Correct option: C.
Lanthanoids.
The sixth period $\ce{(n = 6)}$ contains $32$ elements and electrons enter $\ce{6s, 4f, 5d}$ and $\ce{6p}$ orbitals, in the order of filling up of the $4f$ orbitals begins with cerium $\ce{(Z = 58)}$ and ends at lutetium $\ce{(Z = 71)}$ to give the $\ce{4f}-$ inner transition series which is called the lanthanoid series.

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