Q. 2

Which of the following is not an actinoid?
A. Curium (Z = 96)

B. Californium (Z = 98)

C. Uranium (Z = 92)

D. Terbium (Z = 65)

Answer :

Terbium is a lanthanoid as it has z=65. Actinoids are the elements which have an atomic number in the range of 89-103.


As shown in the above periodic table Tb is a lanthanoid and is in that series.

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