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  4. Among the elements given below, the total number of actinoids is . Ce,Eu,Th,No,Pa,Pu,Tm

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Q. Among the elements given below, the total number of actinoids is ______.
$Ce,Eu,Th,No,Pa,Pu,Tm$

NTA AbhyasNTA Abhyas 2022

Solution:

Actinides are elements with atomic numbers from 90 to 103 following element Actinium. They include naturally occurring elements of thorium, protactinium and uranium and eleven transuranic i.e., artificially produced by nuclear reactions. Among the given elements, $Th,No,Pa$ and $Pu$ are actinides.