Which of the following oxidation states is the most common among the lanthanoids?
- A$4$
- B$2$
- C$5$
- D$3$
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(At nos. : $La=57, Ce=58, Eu=63$ and $Yb=70$ )
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View SolutionIn lanthanides,with an increase in atomic number,the atomic radius decreases,except for the element $\underline{X}$. What is $\underline{X}$?
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