what-is-the-electron-configuration-for-a-chloride-ion

##1″s”^2 2″s”^2 2″p”^6 3″s”^2 3″p”^6##

OR

##”[Ne]” 3″s”^2 3″p”^6##

The of a chlorine atom (##”Cl”##) is as follows:

##1″s”^2 2″s”^2 2″p”^6 3″s”^2 3″p”^5##

But a chlorine ion (##”Cl”^-##) has acquired a ##”(1)-“## charge as a result of gaining 1 electron. Thus, its electron configuration is:

##1″s”^2 2″s”^2 2″p”^6 3″s”^2 3″p”^6##

This may also be expressed as:

##”[Ne]” 3″s”^2 3″p”^6##

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