MHT CET · Chemistry · d and f Block Elements
Which among the following lanthanoids, shows only \(+3\) oxidation state?
- A Terbium
- B Gadolinium
- C Neodynium
- D Cerium
Answer & Solution
Correct Answer
(B) Gadolinium
Step-by-step Solution
Detailed explanation
(B)
Gadolinium \(\rightarrow\) [Xe] \(4 \mathrm{f}^{7} 5 \mathrm{~d}^{1} 6 \mathrm{~s}^{2}\)
The extra stability of \(\mathrm{Gd}^{3+}\) ion is due to their half-filled f-subshells.
Gadolinium \(\rightarrow\) [Xe] \(4 \mathrm{f}^{7} 5 \mathrm{~d}^{1} 6 \mathrm{~s}^{2}\)
The extra stability of \(\mathrm{Gd}^{3+}\) ion is due to their half-filled f-subshells.
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