Although $(+3)$ oxidation state is the characteristic oxidation state of lanthanoids,cerium shows $(+4)$ oxidation state also. Why?
(N/A) Cerium ($Ce$,atomic number $58$) has the electronic configuration $[Xe] \ 4f^{1} \ 5d^{1} \ 6s^{2}$.
By losing four electrons,it attains the stable noble gas configuration of Xenon $([Xe])$,which is $[Xe] \ 4f^{0} \ 5d^{0} \ 6s^{0}$.
This extra stability associated with the empty $4f$ subshell allows cerium to exhibit the $(+4)$ oxidation state.
By losing four electrons,it attains the stable noble gas configuration of Xenon $([Xe])$,which is $[Xe] \ 4f^{0} \ 5d^{0} \ 6s^{0}$.
This extra stability associated with the empty $4f$ subshell allows cerium to exhibit the $(+4)$ oxidation state.
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Similar Questions
On the basis of Lanthanoid contraction,explain the following :
$(i)$ Nature of bonding in $La_2O_3$ and $Lu_2O_3$.
$(ii)$ Trends in the stability of oxo salts of lanthanoids from $La$ to $Lu$.
$(iii)$ Stability of the complexes of lanthanoids.
$(iv)$ Radii of $4d$ and $5d$-block elements.
$(v)$ Trends in acidic character of lanthanoid oxides.
$(i)$ Nature of bonding in $La_2O_3$ and $Lu_2O_3$.
$(ii)$ Trends in the stability of oxo salts of lanthanoids from $La$ to $Lu$.
$(iii)$ Stability of the complexes of lanthanoids.
$(iv)$ Radii of $4d$ and $5d$-block elements.
$(v)$ Trends in acidic character of lanthanoid oxides.
Difficult
View SolutionFill in the blanks:
$1.$ The size of $M^{3+}$ ions in the actinoid series ........... with an increase in atomic number.
$2.$ The common oxidation state of elements in the actinoid series is .......... .
$3.$ The appearance of elements in the actinoid series is like .......... .
$1.$ The size of $M^{3+}$ ions in the actinoid series ........... with an increase in atomic number.
$2.$ The common oxidation state of elements in the actinoid series is .......... .
$3.$ The appearance of elements in the actinoid series is like .......... .
Difficult
View SolutionWhich one of the following statements related to lanthanons is incorrect?
MediumNEET 2016
View SolutionWhich of the following has $6$ unpaired $f-$electrons?
Easy
View SolutionArrange the following metal complexes/compounds in the increasing order of spin-only magnetic moment. Presume all three are high-spin systems.
(Atomic numbers: $Ce = 58$,$Gd = 64$,and $Eu = 63$.)
$(a)$ $(NH_4)_2[Ce(NO_3)_6]$
$(b)$ $Gd(NO_3)_3$
$(c)$ $Eu(NO_3)_3$
Answer is:
(Atomic numbers: $Ce = 58$,$Gd = 64$,and $Eu = 63$.)
$(a)$ $(NH_4)_2[Ce(NO_3)_6]$
$(b)$ $Gd(NO_3)_3$
$(c)$ $Eu(NO_3)_3$
Answer is:
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