(A) The electronic configurations of the given ions are:$Eu^{2+} (Z=63): [Xe] 4f^7 6s^0$$Gd^{3+} (Z=64): [Xe] 4f^7 5d^0 6s^0$$Eu^{3+} (Z=63): [Xe] 4f^

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(A) The electronic configurations of the given ions are:$Eu^{2+} (Z=63): [Xe] 4f^7 6s^0$$Gd^{3+} (Z=64): [Xe] 4f^7 5d^0 6s^0$$Eu^{3+} (Z=63): [Xe] 4f^6 6s^0$$Tb^{3+} (Z=65): [Xe] 4f^8 6s^0$$Sm^{2+} (Z=62): [Xe] 4f^6 6s^0$Thus,only $Eu^{2+}$ and $Gd^{3+}$ have a $4f^7$ configuration.

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

Medium

Lanthanoid ions with $4f^7$ configuration are :
$A$. $Eu^{2+}$
$B$. $Gd^{3+}$
$C$. $Eu^{3+}$
$D$. $Tb^{3+}$
$E$. $Sm^{2+}$
Choose the correct answer from the options given below :

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$A$ and $B$ only
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$A$ and $D$ only
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$B$ and $E$ only
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$B$ and $C$ only

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d-and f-Block Elements

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Lanthanoids and Actinoids

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Lanthanoid ions with $4f^7$ configuration are :$A$. $Eu^{2+}$$B$. $Gd^{3+}$$C$. $Eu^{3+}$$D$. $Tb^{3+}$$E$. $Sm^{2+}$Choose the correct answer from the options given below :

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In the lanthanide series,the element well known to exhibit $+4$ oxidation state is

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

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Lanthanoid ions with $4f^7$ configuration are :
$A$. $Eu^{2+}$
$B$. $Gd^{3+}$
$C$. $Eu^{3+}$
$D$. $Tb^{3+}$
$E$. $Sm^{2+}$
Choose the correct answer from the options given below :

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