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Which of the following is not an actinoid?

(i) Curium (Z = 96)

(ii) Californium (Z = 98)

(iii) Uranium (Z = 92)

(iv)Terbium (Z = 65)


Answers (1)

The answer is the option (iv) Terbium (Z = 65)

Explanation: Actinoids are the elements with Z= 90 to 103, and they are characterised 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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