(A) Unlike lanthanoids,actinoids exhibit a wider range of oxidation states (from $+3$ to $+7$) because the energy gap between the $5f$,$6d$,and $7s$ s

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Lesser energy difference between $5f$ and $6d$ orbitals than between $4f$ and $5d$ orbitals

(A) Unlike lanthanoids,actinoids exhibit a wider range of oxidation states (from $+3$ to $+7$) because the energy gap between the $5f$,$6d$,and $7s$ subshells is very small. In contrast,the $4f$ orbitals in lanthanoids are more deeply buried and have a larger energy gap relative to the $5d$ and $6s$ orbitals,which limits their oxidation states primarily to $+3$.

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

Medium

The main reason for the larger number of oxidation states exhibited by the actinoids compared to the corresponding lanthanoids is:

AIPMT 2005 All AIPMT

A
Lesser energy difference between $5f$ and $6d$ orbitals than between $4f$ and $5d$ orbitals
B
Larger atomic size of actinoids than the lanthanoids
C
More energy difference between $5f$ and $6d$ orbitals than between $4f$ and $5d$ orbitals
D
Greater reactive nature of the actinoids than the lanthanoids

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d-and f-Block Elements

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Lanthanoids and Actinoids

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AIPMT 2005 Paper All AIPMT years →

Which one of the following statements concerning lanthanide elements is false?

Easy

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Which of the following lanthanoid ions is diamagnetic?
(At. nos. $Ce = 58, Sm = 62, Eu = 63, Yb = 70$)

MediumNEET 2013

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Identify the incorrect statement among the following.

MediumAIPMT 2007

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Write the electronic configurations of the elements with the atomic numbers $61$,$91$,$101$ and $109$.

Medium

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Match the element/compound given in List-$I$ with the uses given in List-$II$:

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

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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

The main reason for the larger number of oxidation states exhibited by the actinoids compared to the corresponding lanthanoids is:

Similar Questions

Which one of the following statements concerning lanthanide elements is false?

Which of the following lanthanoid ions is diamagnetic?(At. nos. $Ce = 58, Sm = 62, Eu = 63, Yb = 70$)

Identify the incorrect statement among the following.

Write the electronic configurations of the elements with the atomic numbers $61$,$91$,$101$ and $109$.

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Which of the following lanthanoid ions is diamagnetic?
(At. nos. $Ce = 58, Sm = 62, Eu = 63, Yb = 70$)