Which of the following is not an actinoid?

Question:

Which of the following is not an actinoid?

(i) Curium (Z = 96)

(ii) Californium (Z = 98)

(iii) Uranium (Z = 92)

(iv) Terbium (Z = 65)

Solution:

Option (iv) Terbium (Z = 65) is the answer.

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