Chemistry PYQ 291 of 291 · Radioactivity

Which of the following is not a radioactive element?

  1. AUranium
  2. BRadium
  3. CThorium
  4. DCadmium
  5. ENone of the above/More than one of the above

BPSC CDPO Prelims 2018

Show answer and explanation

Correct answer: (d) Cadmium

Explanation

Cadmium is a stable, non-radioactive metal. It is toxic, and it is used in nickel–cadmium batteries and in reactor control rods, where it absorbs neutrons.

Uranium, radium and thorium are all radioactive.

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