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GK QUESTION#3337

Which of the following elements is a member of the actinide series?

  1. ALutetium
  2. BThoriumCorrect answer
  3. CMagnesium
  4. DLanthanum
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Answer

B. Thorium

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Explanation

Thorium, symbol Th and atomic number 90, is an actinide. Lutetium and lanthanum belong to the lanthanide series in its common broad usage, while magnesium is a Group 2 alkaline earth metal. Thus thorium is the actinide among the choices.

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