What is the correct order of ionic radii for the $+3$ oxidation state in $Ce, La, Pm,$ and $Yb$?
- A$La^{3+} < Pm^{3+} < Ce^{3+} < Yb^{3+}$
- B$La^{3+} < Ce^{3+} < Pm^{3+} < Yb^{3+}$
- C$Yb^{3+} < Ce^{3+} < Pm^{3+} < La^{3+}$
- D$Yb^{3+} < Pm^{3+} < Ce^{3+} < La^{3+}$
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$1.$ The atomic radii of the elements of the third transition series are .......... to those of the corresponding elements of the second transition series.
$2.$ Samarium melts at .......... $K$.
$3.$ The color of lanthanoid ions is due to the presence of .......... electrons.
$1.$ The atomic radii of the elements of the third transition series are .......... to those of the corresponding elements of the second transition series.
$2.$ Samarium melts at .......... $K$.
$3.$ The color of lanthanoid ions is due to the presence of .......... electrons.
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View SolutionThe ionic radius of $La^{3+}$ is $1.06 \ \mathop{A}\limits^o$. Which of the following is the closest value for the ionic radius of $Lu^{3+}$ in $\mathop{A}\limits^o$? $(Lu = 71, La = 57)$
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View SolutionWhich oxidation state is common for lanthanoid elements?
Assertion : Magnetic moment values of actinides are lesser than the theoretically predicted values.
Reason : Actinide elements are strongly paramagnetic.
Reason : Actinide elements are strongly paramagnetic.
MediumAIIMS 2016
View SolutionThe most common oxidation state of Lanthanoid elements is $+3$. Which of the following is likely to deviate easily from $+3$ oxidation state?
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