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MHT CET202611 April 2026Evening ShiftChemistryd and f Block ElementsActual

Which of the following lanthanoids is radioactive?

Options

  1. ATm
  2. BDy
  3. CEu
  4. DPm

Correct answer

D. Pm

Step-by-step solution

Promethium (Pm) is the only radioactive element among the lanthanoids. Its atomic number is 61 and all of its isotopes are radioactive. Answer: Pm

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