A chloride ion (\(Cl^{-}\)) and an argon (Ar) atom are isoelectronic species, meaning they have the same number of electrons (18), but they are not the same because they have a different number of protons and therefore different chemical properties. The chloride ion has 17 protons and is a reactive anion with a \(-1\) charge, while the argon atom has 18 protons and is a stable, inert noble gas with a neutral charge.
Chloride ion and Argon are:
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