Which noble gas has the same electron configuration as each...

Which noble gas has the same electron configuration as each of the ions in the following compounds?
a. calcium bromide, $\mathrm{CaBr}_{2}$
b. aluminum selenide, $\mathrm{Al}_{2} \mathrm{Se}_{3}$
c. strontium oxide, $\mathrm{SrO}$
d. potassium sulfide, $\mathrm{K}_{2} \mathrm{~S}$

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Key Concepts

Ionic Compounds

Ionic compounds are composed of positive and negative ions that are held together by electrostatic forces. In these compounds, the ions typically form by transferring electrons so that they achieve electron configurations similar to those of noble gases, which imparts greater energetic stability.

Electron Configuration

Electron configuration refers to the distribution of electrons among the orbitals of an atom or ion. It is fundamental to understanding chemical properties, reactivity, and the formation of bonds, as ions often adjust their electron count to mimic the highly stable configurations of noble gases.

Noble Gas Electron Configuration

Noble gases are elements whose electron shells are completely filled, resulting in exceptionally stable electron configurations. These configurations are used as benchmarks when comparing other atoms or ions, as many ions in chemical compounds attain similar arrangements to achieve stability.

Isoelectronic Species

Isoelectronic species are atoms or ions that have the same number of electrons and an identical electron configuration despite differences in their nuclear charges. In many ionic compounds, ions lose or gain electrons until their electron configurations match those of a noble gas.

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