Q.Which of the following lanthanoids shows the $+2$ oxidation state due to a stable $f^7$ or $f^{14}$ configuration?

Eu

and

Yb

Ce

and

Gd

La

and

Lu

Pm

and

Sm

The correct solution involves applying the fundamental concept to derive the final value step by step...

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Q.Which of the following lanthanoids shows the +2+2+2 oxidation state due to a stable f7f^7f7 or f14f^{14}f14 configuration?