Which of the following is not an actinoid?

  1. A

    Curium (Z=96)

  2. B

    Californium (Z =98)

  3. C

    Uranium (Z =92)

  4. D

    Terbium (Z =65) 

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    Solution:

    Actinoids are atomic numbers 89 to 103 of elements. Terbium (Z=65) is not an actinoid as a result.

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