Which of the following is not an actinoid?

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Cerium (Z = 96)

Californium (Z = 98)

Uranium (Z = 92)

Terbium (Z = 65)

answer is D.

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Detailed Solution

Elements with atomic number, z = 90 to 103 are called actinoids. Thus, terbium (Z = 65) is not an actinoid. Terbium belong to lanthanoids.

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