Rare-earth elements are exhibited by
- AAt. No. $58$ to $71$
- BAt. No. $21$ to $30$
- CAt. No. $39$ to $71$
- DAt. No. $81$ to $91$
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Similar Questions
Which one of the following lanthanoids does not form $MO_{2}$? [$M$ is lanthanoid metal]
The $f$ orbitals are half-filled and completely filled,respectively,in which of the following lanthanide ions?
(Given: Atomic numbers: $Eu=63, Sm=62, Tm=69, Tb=65, Yb=70, Dy=66$)
(Given: Atomic numbers: $Eu=63, Sm=62, Tm=69, Tb=65, Yb=70, Dy=66$)
Which is the correct order of ionic sizes $(At. \, No. : Ce = 58, Sn = 50, Yb = 70, Lu = 71)$?
MediumAIEEE 2002
View SolutionIn lanthanides,with increase in atomic number,atomic radius decreases,except for the element $\underline{ X }$. What is $\underline{ X }$?
What is the electronic configuration of $Nd^{2+}$?
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