Chemistry · Lanthanoids: Electronic configuration, oxidation states and Lanthanoid contraction
Which of the following Lanthanoid is radioactive?
Which of the following Lanthanoid is radioactive?
- A. Cerium
- B. Promethium
- C. Thulium
- D. Lutetium
Step-by-step solution
Among the lanthanides, promethium (Pm) is the only one that is radioactive. All other lanthanides have stable isotopes, while promethium has no stable isotopes and decays radioactively.
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