The species isoelectric to [tex]\rm Br^-[/tex] are Kr, [tex]\rm Se^2^-\;,\;\,Rb^+\;,\;and\;Sr^2^+[/tex].
Isoelectronic species are the ones that have the same number of electrons. By gaining the electrons or losing electrons, the same electronic configuration can be achieved.
The Bromide ion, [tex]\rm Br^-[/tex] has 36 electrons. The Krypton (Kr) also has 36 electrons.
Selenium has 34 electrons and a gain of 2 electrons will form 36 electrons. Thus [tex]\rm Se^2^-[/tex] has 36 electrons.
The Rubidium has 37 electrons and losing 1 electron will result in 36 electrons. Thus [tex]\rm Rb^+[/tex] has 36 electrons.
Strontium has 38 electrons, the loss of 2 electrons will result in 36 electronic configurations. Thus [tex]\rm Sr^2^+[/tex] has 36 electrons.
The species isoelectric to [tex]\rm Br^-[/tex] are Kr, [tex]\rm Se^2^-\;,\;\,Rb^+\;,\;and\;Sr^2^+[/tex].
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