Ncert Exercises & Solutions

Among the following elements, identify the one that is not an actinoid :
1. Curium (Z = 96)
2. Californium (Z = 98)
3. Uranium (Z = 92)
4. Terbium (Z = 65)

HINT: Actinoids atomic number start from 89.

Explanation:

Elements with atomic number, Z=89 to 103 are called actinoids. Thus, Terbium (Z=65) is not an actinoid.

Terbium belong to lanthanoids.

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