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JEE Main 202227 JuneEvening Shift

Exam: JEE Main
Year: 2022
Date: 27 June
Shift: Evening Shift
Subject: Chemistry
Chapter: d and f Block Elements

JEE Main 2022 · 27 June · Evening Shift · Chemistry · d and f Block Elements

The ' f ' orbitals are half and completely filled, respectively in...

The '

f

' orbitals are half and completely filled, respectively in lanthanide ions [Given : Atomic no.

Eu, 63: Sm, 62: Tm, 69; Tb, 65; Yb, 70; Dy, 66

]

Options

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

Correct answer

C. ${Tb}^{4 +}$ and ${Yb}^{2 +}$

Step-by-step solution

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

Hence, the ions with half and completely filled configurations are ${Tb}^{4 +}and{Yb}^{2 +}$

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