The number of $f$-electrons in the $+3$ oxidation state of gadolinium $(Z=64)$ is $x$ and in the $+2$ oxidation state of ytterbium $(Z=70)$ is $y$. The sum of $x$ and $y$ is:
- A$13$
- B$20$
- C$18$
- D$21$
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Lanthanoids $(Ln)$ are well known for their $+3$ oxidation state. Which of the following statements is $NOT$ applicable to them?
Easy
View SolutionThe pair of lanthanides in which both elements have high third-ionization energy is:
The electronic configuration of Einsteinium is : (Given atomic number of Einsteinium $= 99$)
Which of the following factors may be regarded as the main cause of lanthanide contraction?
Identify the lanthanoid element from the following.
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