What is the effect of lanthanoid contraction in the lanthanoid series of elements?

  • A
    Increase in both atomic and ionic radii
  • B
    Decrease in atomic radii and increase in ionic radii
  • C
    Decrease in both atomic and ionic radii
  • D
    Increase in atomic radii and decrease in ionic radii

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Which of the following $f$-block elements exhibits the highest oxidation state?

Identify the incorrect statement among the following.

$A$ lanthanoid has $n$ unpaired electrons and another lanthanoid has $(14-n)$ unpaired electrons. It means:

The lanthanoid that would show color is

Identify the ion having $4f^6$ electronic configuration.

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