The $f$ orbitals are half-filled and completely filled,respectively,in which of the following lanthanide ions?
(Given: Atomic numbers: $Eu=63, Sm=62, Tm=69, Tb=65, Yb=70, Dy=66$)

  • A
    $Eu^{2+}$ and $Tm^{2+}$
  • B
    $Sm^{2+}$ and $Tm^{3+}$
  • C
    $Tb^{4+}$ and $Yb^{2+}$
  • D
    $Dy^{3+}$ and $Yb^{3+}$

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