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4. d and f- block elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
Incorrect statement for the given configuration $[Xe]\,4f^7\,5d^1\,6s^2$
  • ✓
    It placed in $d-$ block, $IIIB$ group, $6^{th}$ period
  • B
    It is a natural element
  • C
    It have maximum unpaired $e^-$ in lanthanoids
  • D
    It is $Gd$
✓

Answer

Correct option: A.
It placed in $d-$ block, $IIIB$ group, $6^{th}$ period
a
The element with the electronic configuration $[X e] 4 f^{7} 5 d^{1} 6 s^{2}$ is Gadolinium (Gd). It is a lanthanoid and lies in the f-block, IIIB group.

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