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Q.

Which of the following is not an actinoid?

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a

Curium (Z = 96)

b

Californium (Z = 98)

c

Uranium (Z = 92)

d

 Terbium (Z = 65)

answer is D.

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Detailed Solution

Actinoids are the elements with Z= 90 to 103, and they are characterized by the outer electronic configuration 

(n-2)f^{14}(n-1)d ns^{2}

 In an actinoid the last electron enters the f-orbital, and that is not the case in Terbium, and hence it is not an actinoid, but it is a lanthanoid.

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