Which of the following is not an actinoid?

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Solution

Elements with Atomic number 90 to 103 are called as actinoids.
Terbium( Tm) has a atomic number of 65.

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(A t . n o . S m, 62; E r, 68; Y b, 70; L u, 71; E u, 63; T b, 65; T m, 69)