(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