TS EAMCET · Chemistry · d and f Block Elements
Which of the elements possess only one electron in \(5 d\)-orbital?
- A \({ }^{69} \mathrm{Tm},{ }^{61} \mathrm{Pm}\)
- B \({ }^{59} \mathrm{Pr},{ }^{71} \mathrm{Lu}\)
- C \({ }^{57} \mathrm{La},{ }^{61} \mathrm{Pm}\)
- D \({ }^{57} \mathrm{La},{ }^{71} \mathrm{Lu}\)
Answer & Solution
Correct Answer
(D) \({ }^{57} \mathrm{La},{ }^{71} \mathrm{Lu}\)
Step-by-step Solution
Detailed explanation
\({ }^{57} \mathrm{La}\) and \({ }^{71}\) Lu have \(d^1\) electronic configuration. Electronic configuration of \({ }^{57} \mathrm{La}=\left[{ }^{54} \mathrm{Xe}\right] 5 d^1 6 s^2\) Electronic configuration of \({ }^{71} \mathrm{Lu}=\left[{ }^{54}\right] 4 f^{14} 5 d^1\)
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