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  4. Which of the following is not an actinide?

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Q. Which of the following is not an actinide?

Delhi UMET/DPMTDelhi UMET/DPMT 2005

Solution:

(i) Curium (At. no. $96$) belongs to actinide.
(ii) Californium (At. no. $98$) belongs to actinide.
(iii) Uranium (At. no. $92$) belongs to actinide.
(ii) Terbium (At. no. $65$) belongs to lanthanide series.
$\therefore $ Terbium is the correct answer.(i) Curium (At. no. $96$) belongs to actinide.
(ii) Californium (At. no. $98$) belongs to actinide.
(iii) Uranium (At. no. $92$) belongs to actinide.
(ii) Terbium (At. no. $65$) belongs to lanthanide series.