Arrange the ions $Ce^{3+}$,$La^{3+}$,$Pm^{3+}$,and $Yb^{3+}$ in the increasing order of their ionic radii.
- A$Yb^{3+} < Pm^{3+} < Ce^{3+} < La^{3+}$
- B$Ce^{3+} > Yb^{3+} < Pm^{3+} < La^{3+}$
- C$Yb^{3+} > Pm^{3+} < La^{3+} < Ce^{3+}$
- D$Pm^{3+} < La^{3+} < Ce^{3+} > Yb^{3+}$
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$1.$ In the elements of the actinoid series,the last electron enters the ........... orbitals.
$2.$ Inner transition elements are the elements of the .......... series.
$3.$ If electrons are filled in the $5f$ series,those elements are called ....... elements.
$4.$ Many elements of the actinoid series are ......... .
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