The 'f' orbitals are half and… - JEE Main 2022 Chemistry PYQ

JEE Main 2022 — Chemistry Inorganic Chemistry

2022mcqmedium

The ' $f$ ' orbitals are half and completely filled, respectively in lanthanide ions [Given : Atomic no. $\mathrm{Eu},63:\mathrm{Sm},62:\mathrm{Tm},69;\mathrm{Tb},65;\mathrm{Yb},70;\mathrm{Dy},66$ ]

Official previous-year question

Held on 27 Jun 2022 · Verified 6 Jul 2026.

Options

A
${\mathrm{Eu}}^{2+}$ and ${\mathrm{Tm}}^{2+}$
B
${\mathrm{Sm}}^{2+}$ and ${\mathrm{Tm}}^{3+}$
C
${\mathrm{Tb}}^{4+}$ and ${\mathrm{Yb}}^{2+}$
D
${\mathrm{Dy}}^{3+}$ and ${\mathrm{Yb}}^{3+}$

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Solution

Ion	Electronic configuration
${\mathrm{Eu}}^{2+}$	$4{f}^{7}$
${\mathrm{Tm}}^{2+}$	$4{f}^{13}$
${\mathrm{Sm}}^{2+}$	$4{f}^{6}$
${\mathrm{Tm}}^{3+}$	$4{f}^{12}$
${\mathrm{Tb}}^{4+}$	$4{f}^{7}$
${\mathrm{Yb}}^{2+}$	$4{f}^{14}$
${\mathrm{Dy}}^{3+}$	$4{f}^{9}$
${\mathrm{Yb}}^{3+}$	$4{f}^{13}$

Hence, the ions with half and completely filled configurations are

{\mathrm{Tb}}^{4+}\mathrm{and}{\mathrm{Yb}}^{2+}

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Solution

Ion	Electronic configuration
${\mathrm{Eu}}^{2+}$	$4{f}^{7}$
${\mathrm{Tm}}^{2+}$	$4{f}^{13}$
${\mathrm{Sm}}^{2+}$	$4{f}^{6}$
${\mathrm{Tm}}^{3+}$	$4{f}^{12}$
${\mathrm{Tb}}^{4+}$	$4{f}^{7}$
${\mathrm{Yb}}^{2+}$	$4{f}^{14}$
${\mathrm{Dy}}^{3+}$	$4{f}^{9}$
${\mathrm{Yb}}^{3+}$	$4{f}^{13}$

Hence, the ions with half and completely filled configurations are

{\mathrm{Tb}}^{4+}\mathrm{and}{\mathrm{Yb}}^{2+}

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