JEE Main202225 Jun 2022Morning ShiftChemistryStructure of AtomActual

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

Options

ABr - and Be 2 +
BCl - and Li +
CS 2 - and K +
DO 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 +   &   O 2 - are isoelectronic with Al 3 +

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