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MHT CET Chemistry d and f Block Elements 2026 MHT CET 2026 (11 April Shift 2)

MHT CET Chemistry Question (2026) — Solution

Question

Which of the following lanthanoids is radioactive?

Options

  1. A. Tm
  2. B. Dy
  3. C. Eu
  4. D. Pm

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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