(D) The lanthanoids are a series of elements from atomic number $57$ to $71$. Among these, $Pm$ (Promethium, atomic number $61$) is the only synthetic

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(D) The lanthanoids are a series of elements from atomic number $57$ to $71$. Among these, $Pm$ (Promethium, atomic number $61$) is the only synthetic radioactive element. All its isotopes are radioactive.Therefore, the correct option is $D$.

Class 12 Chemistry d-and f-Block Elements Lanthanoids and Actinoids

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Which of the following lanthanoids is radioactive?

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A
$Tm$
B
$Dy$
C
$Eu$
D
$Pm$

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d-and f-Block Elements

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Lanthanoids and Actinoids

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The separation of $Lanthanoid$ elements is based on which of the following?

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Which of the following lanthanoids is radioactive?

Similar Questions

What is lanthanoid contraction? What are the consequences of lanthanoid contraction?

The electronic configurations of bivalent europium and trivalent cerium are(atomic number : $Xe=54, Ce=58, Eu=63$ )

Which of the following properties decreases on moving from $Ce$ to $Lu$?

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The electronic configurations of bivalent europium and trivalent cerium are
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