Which of the following ins not an actionid?
(a) Curium (Z= 96)
(b) Californium (Z= 98)
(c) Uranium (Z = 92)
(d) Terbium (Z = 65)

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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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