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JEE Main 202225 JuneMorning Shift

Exam: JEE Main
Year: 2022
Date: 25 June
Shift: Morning Shift
Subject: Chemistry
Chapter: Structure of Atom

JEE Main 2022 · 25 June · Morning Shift · Chemistry · Structure of Atom

The pair, in which ions are isoelectronic with Al ^ 3 + is

The pair, in which ions are isoelectronic with

{Al}^{3 +}

is

Options

A ${Br}^{-}$ and ${Be}^{2 +}$
B ${Cl}^{-}$ and ${Li}^{+}$
C ${S}^{2 -}$ and ${K}^{+}$
D ${O}^{2 -}$ and ${Mg}^{2 +}$

Correct answer

D. ${O}^{2 -}$ and ${Mg}^{2 +}$

Step-by-step solution

Isoelectronic species are known as atoms or ions that have the same number of electrons.

Species	${Al}^{3 +}$	${Mg}^{2 +}$	${Be}^{2 +}$	${O}^{2 -}$	${Br}^{-}$	${Cl}^{-}$	${Li}^{+}$	${S}^{2 -}$	${K}^{+}$
No. of ${e}^{-}$	$10$	$10$	$2$	$10$	$36$	$18$	$2$	$18$	$18$

So ${Mg}^{2 +} \text{ and } {O}^{2 -}$ are isoelectronic with ${Al}^{3 +}$

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