Q25 / 150 · MHT CET 2021 (22 Sep Shift 2) · Chemistry

Which element from following is radioactive?

  • A
    Pr
  • B
    Nd
  • Correct answer
    C
    Pm
  • D
    Sm

Solution

Promethium is a chemical element with the symbol $\mathrm{Pm}$ and atomic number 61. All of its isotopes are radioactive; it is extremely rare, with only about 500-600 grams naturally occurring in Earth's crust at any given time.

Hence, the correct answer is option: 'C'.

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