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Chapter 6: Q79E. (page 337)

Which atom and/or ion is (are) isoelectronic with\(\begin{aligned}{{}{}}{{\bf{B}}{{\bf{r}}^ + }:{\rm{ }}{\bf{S}}{{\bf{e}}^{{\bf{2}} + }},{\rm{ }}{\bf{Se}},{\rm{ }}{\bf{A}}{{\bf{s}}^--},{\rm{ }}{\bf{Kr}},{\rm{ }}{\bf{G}}{{\bf{a}}^{{\bf{3}} + }},{\rm{ }}{\bf{C}}{{\bf{l}}^--}?}\\\;\end{aligned}\)

Short Answer

Expert verified

Se and\(A{s^ - }\) are isoelectronic with Br+

Step by step solution

01

Isoelectronic species

An atom is isoelectronic with another if they both have the same number of total electrons. In other words, isoelectronic atoms/ ions are atoms with the same electron configuration.

02

Ions/atoms that are isoelectronic with Br+    

Valence shell electronic Configuration of Br+= 4p4

Configuration of elements given in the question

\(\begin{aligned}{{}}{S{e^{2 + }} = {\rm{ }}4{p^2}}\\{Se{\rm{ }} = {\rm{ }}4{p^4}}\\{A{s^ - } = {\rm{ }}4{p^4}}\\{Kr{\rm{ }} = {\rm{ }}4{p^6}}\\{G{a^{3 + }} = {\rm{ }}3{d^{10}}}\\{C{l^ - } = {\rm{ }}3{p^5}}\end{aligned}\)

Observing the given configuration, we can conclude that Se and\({\bf{A}}{{\bf{s}}^ - }\) are isoelectronic with\({\bf{B}}{{\bf{r}}^ + }\).

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