Which of the following elements is an actinide?

Name: Which of the following elements is an actinide?
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Question

Quizplus · Accepted Answer

Actinides are elements in the f-block of the periodic table, specifically in period 7. Np (neptunium) is an element in period 7 and therefore an actinide. Pr (praseodymium) is in the lanthanide series, which is also in the f-block, but it is not an actinide. W (tungsten) is in group 6 and Fr (francium) is in group 1, neither of which are in the f-block or actinides.

Which of the Following Elements Is an Actinide