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GK QUESTION#3339

Which radioactive element has atomic number 43 and no stable isotopes?

  1. APromethium
  2. BNobelium
  3. CTechnetiumCorrect answer
  4. DNeptunium
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Answer

C. Technetium

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Explanation

Technetium has symbol Tc and atomic number 43. It has no stable isotopes. Promethium is element 61, nobelium 102 and neptunium 93. All known technetium isotopes are radioactive.

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