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(D) The lanthanoids are the elements from $Z = 57$ to $71$. $La$ $(Z = 57)$ is the first element of the $4f$ series and is often considered the protot

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$La$

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(D) The lanthanoids are the elements from $Z = 57$ to $71$. $La$ $(Z = 57)$ is the first element of the $4f$ series and is often considered the prototype for lanthanoid chemistry due to its $3+$ oxidation state and ionic radius similarity. $Lu$ $(Z = 71)$ is the last element of the lanthanoid series. $Ce$ $(Z = 58)$ is a lanthanoid itself. $Lr$ $(Z = 103)$ is an actinoid. Among the given options,$La$ is the most characteristic element representing the lanthanoid series properties.

List-$I$ (Element/Compound)	List-$II$ (Use)
$A$. Lanthanoid oxide	$1$. Production of iron alloys
$B$. Lanthanoid	$2$. Television screens
$C$. Mischmetal	$3$. Petroleum cracking
$D$. Magnesium based alloy	$4$. Lanthanoid metal $+$ iron
$E$. Mixed lanthanoid oxides	$5$. Bullet tips
	$6$. $X$-ray screens

Which of the following elements shows the greatest similarity to the lanthanoids?

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